This system has one solution. what is the y-coordinate of the solution? y = 8x – 9 y = x^2 + 8x – 9

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

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Ive seen this before! the answer is b