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a = -2
b = -1
Y-b = m(x-a)
y+1 = 1(x+2)
y+1 = x +2
y-x = 2-1
y-x = 1
maka m2=1
karena kalo sejajar m1=m2
y-y1=m(x-x1)
y-(-1) = 1(x-(-2))
y+1=x+2
y=x+2-1
y=x+1