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2y = -x +3
y = -1/2 x + 3/2
gradien 1 = -1/2
m1 . m2 = -1
-1/2 . m2 = -1
m2 = 2
y-0 = 2(x-0)
y = 2x
x+2y=3
y = (3-x)/2
maka gradiennya = -1/2
karena tegak lurus maka m1.m2 = -1
-1/2.m2=-1
m2 = 2
persamaan garis ke 2
y - y1 = m(x - x1)
y = 2x
y-2x = 0