Asked by lily
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 =
{x-y=-11
{y+7=-2x
Enter your answer in the box.
y =
Answers
Answered by
Damon
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
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
Answered by
Mable
(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
(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
Answered by
lily
so y=5
Answered by
Damon
yes
Answered by
Anonymous
y=7/2x