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15x+(-5)=225
b. x1.x+y1.y+A/2(x+x1)+B/2(y+y1)+c=0
15x+(-5)y+(-6)/2(x+15)+8/2(y+(-5))+(-120)
15x-5y-3(x+15)+4(y-5)-120
15x-5y-3x-45+4y-20-120
12x-y-185=0
2x-y=185
insyaallah