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y-3 = 2(x-1)
y-3 = 2x - 2
0= 2x-y+1
b. y=2x+5
m1= 2
tegak lurus m1.m2=-1
2.m2=-1
m2=-1/2
y-y1=m(x-x1)
y-1=-1/2(x-3)
------------------dikali 2
2y-2 = -1(x-3)
2y-2=-x+3
x+2y-5=0