Question

Solve the system of equations.

5x + y = 9
3x + 2y = 4

(-2, 5)

(1, 4)

(2, -1)

(4, -4)

Answer 1

C

Answer 2

Choose the equivalent system of linear equations that will produce the same solution as the one given below.

6x + 2y = -6
3x - 4y = -18

12x + 4y = -12
15x = -30

8x + 4y = -4
14x = -10

6x - 8y = -36
-6y = -42

6x - y = -15
3y = 9

Answer 3

@longboardman15 it is possible to do it that way, but the person should know how to do it without having the choices.

Answer 4

okay yhanks

Answer 5

Whoops, I'm wrong. I'll see what I did wrong.

Answer 6

I'll use substitution since it is easy to solve for y.

5x + y = 9
This is y = -5x + 9

3x + 2(-5x + 9) = 4

3x -10x + 18 = 4

-7x = -14

x = 2

Put x into x of the second equation.

3(2) + 2y = 4

6 + 2y = 4

2y = -2

y = -1

(2, -1)