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m=1
y-y1=m(x-x1)
y+1=1(x+2)
y+1=x+2
y=x+1
y= -1
maka m = y/x = -1/1 = -1
maka = y-b = m(x-a)
y+1 = -1 (x+2)
y+1 = -x -2
y+x = -2-1
y+x = -3