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y-0=1/3(x-4)
y-0=1/3x-4/3
y =1/3x-4/3
b)y-y1/y2-y1=x-x1/x2-x1
y-5/-2-5 =x-1/3-1
y-5/ -7 =x-1/2
(perkalian silang)
2(y-5)= -7(x-1)
2y-10= -7x+7
2y = -7x+7+10
2y = -7x+17
y = -7/2 +17/2