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4y = 2x + 8
y = 2/4x + 8/4
y = 1/2 x + 2
dua grs saling tegak lurus, maka m1xm2 = -1
m1= 1/2 ---> m2 = -2
persamaan grs nya y = -2x + 2 ---> y + 2x = 2