Question

This system has one solution.

What is the y-coordinate of the solution?

y = 8x – 9
y = x^2 + 8x – 9

Answer 1

hi !

y=8x-9
y=x²+8x-9


x=(y+9)/8
y=x²+8x-9


x=(y+9)/8
y=((y+9)/8)²+8((y+9)/8)-9


x=(y+9)/8
y=(y+9)²/8²+y+9-9


x=(y+9)/8
y=(y+9)²/64+y


x=(y+9)/8
(y+9)²/64=0


x=(y+9)/8
(y+9)²=0


x=(y+9)/8
y+9=0


x=(y+9)/8
y=-9


x=(-9+9)/8
y=-9


x=0
y=-9