Mathematics College

Solve.
3х + у =4
2x+y=5
Use the linear combination method

Answers

Answer 1

Answer:

x = -1 , y= 7

Step-by-step explanation:

3х + у = 4 .....equation 1

2x + y= 5 ....equation 2

Solving using linear combination method:

---------------------------------------------------------------

3х + у = 4

-2x - y = -5

-------------------...........Here the y cancels out.

x = -1

if x = -1

2x + y= 5

2(-1) + y = 5

y = 5 + 2

y = 7

Related Questions

An analysis of past maintenance costs indicates that maintenance cost is an average of $0.20 per machine-hour at an activity level of 10,000 machine-hours and $0.25 per machine-hour at an activity level of 8,000 machine-hours. If this activity is within the relevant range, what is the total expected maintenance cost if the activity level is 8,700 machine-hours?

Answers

Answer: $2000

Step-by-step explanation:

Variable cost = Change in cost ÷ Activity change

($2000 - $2000) ÷ (10000 - 8000) = $0

Fixed cost element = Final cost - Variable cost

$2000 - ($0.00 ×10000) = $2000

Therefore, the cost formula for total maintenance is $2000 plus $0 per hour

y = $2,000 + $0x

At a level of 8,700 machine-hours, the total cost is:

y = $2000 + ($0.00 ×8700) = $2000

I need Help ASAP I will give you brainlest and plus 5 stars ✨✨and plus thanks and 50 points EVeryONe need help this is due today so plz help me I need to turn it in today so plz help I will give everything if you do

Answers

Answer:

IT  IS THE LAST ONE

I did this a long time ago

Simplify
(4/5x+1)+(2/5x-1)

Answers

Answer:

0.4

Step-by-step explanation:

Hope this helps

What is the area of a parallelogram with a base of 7 meters and a height of 6 meters?
26 m2
42 m2
13 m2
35 m2

Answers

Answer:

the answer is 42 m2

Step-by-step explanation:

7×6=42

The length of a rectangle is 5 cm longer than its width.
If the perimeter of the rectangle is 34 cm , find its area.

Answers

Answer:

A=66

Step-by-step explanation:

P=2(L+W)                             A= 11x6=66

34=2(x+5+x)

34=2(2x+5)

34/2 = 17

17=(2x+5)

17-5=12

12 divided by 2=6

so witch = 6 so 6+5=11 L= 11

3x-y=8
what is the solution

Answers

So this is what Is what I got


Answer= 3x-y-8=0


Sorry if I’m wrong

Find area of a circle of radius 30 cm use

Answers

Answer: A≈2827.43cm²

Step-by-step explanation:

A= πr² =π·30²≈2827.43339cm²

how do you calculate imaginary numbers?

Answers

An imaginary number is a complex number that can be written as a real number multiplied by the imaginary unit i, which is defined by its property i2 = −1. The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25.

A set of ordered pairs is shown. The set does not
represent a function.
{(-2,5), (0, 1), (3,6), (4, 6), (2,3), (5,-2),
(0,8)}
Which ordered pair could be removed from the set so it can represent a function


Answers

when x repeats it is not a function so (0,1) or (0,8) could be removed

What is 31 - (15 + 25) = ? thanks if you help!

Answers

Answer:-9

Step-by-step explanation:

Answer:

-9

Step-by-step explanation:

It is -9 because, using order of operations, you need to do the parentheses first. 25 + 15 is 40. Then, you do subtraction. 31-40=-9.

Hope this helps :)

Maria scored 72, 97, and 82 on her first three math tests. She wants to have a mean score of 82 for the quarter. How many points does she need on her last test to earn an 82 for the quarter?

Answers

Answer:

Step-by-step explanation:

77 points. 82*4=328 328-72-97-82=77 You can check this by adding 77,72,97, and 82, and divide it by 4


someone help me please i don’t know how to do square units

Answers

Answer: 78.

Explaination:

To calculate the area of a triangle, multiply the height by the width aka the "base" then divide by 2.

In this case, the height is 13 and the width is 12.

[tex]S = \frac{height.width}{2} = \frac{13.12}{2} = 78[/tex].

Nick and Darius are playing a number line game in math class. Nick says, "If you multiply my number by itself, you get 64."

What are all the possibilities for Nick's number?

Answers

Answer:

8

Step-by-step explanation:

8multiple by 8 is 64. to find an answer we will do the 8×8=64

Please show me how to do this step by step, I’m confused…

Answers

Here is the answer in exact form or decimal form.

Elaine had StartFraction 5 Over 8 EndFraction of a pizza left after lunch. She told 5 of her friends that they could share the rest. What fraction of the pizza did each of her friends get if they split it evenly?
A pizza with 8 slices. 5 slices are shaded.
StartFraction 1 Over 8 EndFraction
StartFraction 1 Over 5 EndFraction
StartFraction 3 Over 8 EndFraction
StartFraction 3 Over 5 EndFraction
Mark this and return

Answers

They each got 1/8 of a slice

A tin contained 10 3/5 liter of oil . 1 2/7 liter of oil was leaked and 7 1/10 liter used up .Find how much oil is left in the tin.​

Answers

The liter of oil tin contained

[tex] = 10 \ \frac{3}{5} [/tex]

The liter of oil used and leak

[tex] = 1 \frac{2}{7} + 7 \ \frac{1}{10} [/tex][tex] = \frac{9}{7} + \frac{71}{10}[/tex][tex] = \frac{9 \times 10}{7 \times 10} + \frac{71 \times 7}{10 \times 7} [/tex][tex] = \frac{90}{70} + \frac{497}{70} [/tex][tex] = \frac{587}{70} [/tex]

The liter of oil left in the tin

[tex] = \frac{53}{5} - \frac{587}{70} [/tex][tex] = \frac{53 \times 14}{5 \times 14} - \frac{587 \times 1}{70 \times 1} [/tex][tex] = \frac{742 - 587}{70} [/tex][tex] = \frac{155 \div 5}{70 \div 5} [/tex][tex] = \frac{31}{14} [/tex][tex] = 2 \frac{3}{14} [/tex]

~nightmare 5474~

Answer:

2.2 l of oil was left.

Step-by-step explanation:

[tex]Total=10\frac{3}{5} =10.6l\\Used=7\frac{1}{10} =7.1l\\Leaked=1\frac{2}{7} =1.28l\\[/tex]

Total used=7.1l+1.28l=8.38l

[tex]Left=10.6l-8.38l=2.22l[/tex]

The sum of a number and 12 3/4 is 16 4/9. Find the number.

Answers

Answer:

3 25/36

Step-by-step explanation:

16 4/9 - 12 3/4 = 3 25/36

Answer:

[tex]x + 12 \frac{3}{4} = 16 \frac{4}{9} \\ \\ x + \frac{51}{4} = \frac{148}{9} \\ \\ x = \frac{148}{9} - \frac{51}{4} \\ \\ x = \frac{592}{36} - \frac{459}{36} \\ \\ x = \frac{133}{36} \\ \\ \\ x = 3 \frac{25}{36} [/tex]

So; the number

[tex]3 \frac{25}{36} [/tex]

Dante drove 405 miles using 20 gallons of gas.At this rate,how many gallons of gas would he need to drive 243 miles

Answers

[tex]\begin{array}{ccll} miles&gallons\\ \cline{1-2} 405&20\\ 243&g \end{array}\implies \cfrac{405}{243}=\cfrac{20}{g}\implies \cfrac{5}{3}=\cfrac{20}{g}\implies 5g=60 \\\\\\ g = \cfrac{60}{5}\implies g = 12[/tex]

Answer:

12

Step-by-step explanation:

405:20

81:4

243:12

find the area of the quadrilateral.​​

Answers

Step-by-step explanation:

the area of a triangle is baseline × height / 2.

we have 2 major triangles that define this quadrilateral :

A-D-B and C-D-B.

both triangles have the same baseline : M_D + M_B = 14 cm

what we need to do is get the 2 heights M_C and N_A.

N_A we know already : 8 cm

so,

area A-D-B = 14×8/2 = 14×4 = 56 cm²

M_C we get via Pythagoras of the right-angled triangle D-M-C :

D_C² = M_C² + M_D²

10² = M_C² + 6²

100 = M_C² + 36

64 = M_C²

M_C = 8 cm

so,

area C-D-B = 14×8/2 = 56 cm²

so, the total area of the quadrilateral is

56 + 56 = 112 cm²

the hypotenuse of 68 and 51

Answers

Answer:

Hypotenuse is 85

Step-by-step explanation:

Use the Pythagorean theorem to solve:

a^2+b^2=c^2

Answer:

85

Step-by-step explanation:

Pythagorean Theorem

a^2 + b^2 = c^2

Therefore

68^2 = 4624

51^2 = 2601

4624+2601 = 7225

square root of 7225 = 85

determine which point is the solution to the given system y=7x-26, y=4x-11

Answers

substitution
y = 7x-26 (1)

y = 4x-11 (2)

1⇒2

7x-26=4x-11

3x=15

x=5

y = 7(5)-26

y = 9

point (5,9)

help me plzzzzzz don't answer my question if you don't know the answer​

Answers

The prime factors for 66 is 2,3,11 but for the boxes put 2,33,3,11

Prime factors for 42 are 2,3,7 for the boxes put 2,21,3,7

63: 3,7 for boxes put 3,21,3,7

68: 2,34,17 for boxes put 2,34,2,7

92: 2,23 for boxes put 2,46,2,23

40: 2,5,10 for boxes put 2,20,2,10,5,5

What must be done to the expression x +14.1 to make it equal x? ​

Answers

Answer:

  add the opposite of the constant

Step-by-step explanation:

The opposite of the constant must be added to the expression:

  (x +14.1) +(-14.1) = x +(14.1 -14.1) = x +0 = x

Help please??????????

Answers

Answer:

B

Step-by-step explanation:

The graph hits the x axis at 5, -2, and -3/

The answer is b. You’re welcome

Sin(x-y)+sin(x-y prove the identity

Answers

Step-by-step explanation:

[tex] \sin(x - y) + \sin(x + y) = 2 \sin(x) \cos(y) [/tex]

We use the sum and difference identities.

Remeber the sum difference identity is

[tex] \sin(x + y) = \sin(x) \cos(y) + \cos( x ) \sin(y) [/tex]

and

[tex] \sin(x - y) = \sin(x) \cos(y) - \sin(x) \cos(y) [/tex]

So we get

[tex] (\sin(x) \cos(y) - \sin(y) \cos(x) ) + \sin(x) \cos(y) + \sin(y) \cos(x) [/tex]

Combine like Terms.

[tex]2 \sin(x) \cos(y) = 2 \sin(x) \cos(y) [/tex]

We have provided it.

Which triangle is an obtuse scalene triangle?

Answers

Answer:

The answer is A

Step-by-step explanation:

Question 13
Which expression is equivalent to 45x - 15x? Choose all that apply.
A
30
B.
30x
с
60x
D
x(45-15)

Answers

Answer:

  B.  30x

  D.  x(45-15)

Step-by-step explanation:

The distributive property lets you factor out the common factor of x. The sum of coefficients can be simplified to a single coefficient.

  45x -15x = x(45 -15) = 30x

Identify the Input values: (0,2), (1,3), (5,9), (7,13) *

Answers

0, 1, 5, and 7 are the input values. The input values are the x values: (x, y).

An equilateral triangle has an altitude of 21 inches. What is the side length of the triangle?

14√2
7√2
7√3
14√3

55 points simple question!

Answers

Hey, here’s your answer :)

Round 14.5621 to the nearest hundredth. Do not write extra zeros

Answers

Answer:

14.56

Step-by-step explanation:

Answer:

Your answer would be 14.56.

Step-by-step explanation:

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