3x + y = 7

4x + 2y = 16

1) 3x=7-y

X=7-y/3

2) 4x=16-y

X=16-y/4

X = - 1, y = 11

Step-by-step explanation:

Reagange the first equation to the y=mx+b form first by subtracting both sides by 3x.

y = - 3x + 7

then plug that in for y in the second equation and solve for x.

4x + 2 (-3x + 7) = 16

distribute the 2

4x - 6x + 14 = 16

combine like terms

- 2x + 14 = 16

subtract 14 from both sides

-2x = 2

divide by - 2

X = - 1

now plug in x = - 1 into the first equation to find y.

y = - 3 (-1) + 7 = 3 + 7 = 11