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m1= 1
sejajar m1 = m2 = 1
melalui (-2,-1) x1= -2 y1= -1
y-y1 = m2 (x-x1)
y-(-1) = 1 (x-(-2)
y+1 = 1 (x+2)
y+1 = 1x+2
y = 1x +2-1
y = x+1
atau y-x-1=0