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(y-5)(-4+7)-(-1+5)(x+7)=0
(y-5)*3-4(x+7)=0
3y-15-4x-28=0
3y-4x-43=0
3y=(4x+43)/3
y=4/3x+43/3
b) A=(-2,6) B=(0,0)
(y-6)(0+2)-(0-6)(x+2)=0
(y-6)*2-(-6)(x+2)=0
2y-12+6x+12=0
2y+6x=0
2y=-3x/2
y=-3/2x