Respuesta :

Y= 9

Take a look at the picture to see how I solved.

Ver imagen pezgrl78
Cutiepatutie

y-y1=m(x-x1) where (x1, y1)=(1, -7)

y+7=-4(x-1)

y+7=-4x+4

y+7=(-4x+4)*4

y+7=-x+16

y=-x+9

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y=9−x

y−9=−x

−y+9=x

9−y=x

x=9−y

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x=9−y

y*x=9 put 1 in for x

y=9