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x2= -4 y2= 3
x-x1/x2-x1=y-y1/y2-y1
x+2/-4+2=y+4/3+4
x+2/-2 = y+4/7 kali silang
7(x+2) = -2(y+4)
7x+14 = -2y-8
7x+2y = -22