Question

Can someone check this? QRST is a parallelogram. Find x and y. I got :
y-4x=9

y=4x+9

-x+4=y

-x+4=4x+9

-5=5x

x=1 & y=3

Answer 1

Nope. Since 9=y-4x and y=-x+4, then 9=-x+4-4x
which leads to 9=-5x+4
Solve it and x=-1
Now going back to 9=y-4x plug x=-1 in
9=y+4 solve for y and its y=5

Answer 2

or with the other equation with x=-1 which is y=-x+4
y=1+4
y=5

Answer 3

Thanks, I knew I was off but this cleared it up for me

Answer 4

Yea, this problem is a bit tricky.