What is the y-coordinate of the solution for the system of equations?

{x-y=-11
{y+7=-2x
Enter your answer in the box.
y =

5 answers

rewrite first one
x = y -11
use that for x in the second one
y + 7 = -2(y-11)
y + 7 = -2 y + 22

3 y = 15
y = 5

(1) x-y=-11
(2) y+7=-2x

rearrange the equation 1 to get y by itself
-> x=-11+y

substitute that in equation 2
y+7=-2(-11+y)

and solve for y

so y=5

yes

y=7/2x