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per = per
y2-y1 x2-x1
y-4 = x-(-3)
-5-4 2-(-3)
y-4 = x+3 lalu dikali
-9 5 silang
5(y-4) = -9(x+3)
5y-20 = -9x-27
5y+9x = -27+20
5y+9x = -7 atau 5y+9x+7 = 0