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(y-5) / 4 = (x-2) / 2
y- 5 = 2x - 4
y = 2x +1
maka gradien 2
(y-2)/(4-2) = (x-3)/(-1-3)
(y-2) / 2 = (x-3)/-4
-4y + 8 = 2x -6
-4y = 2x - 14
y = - 1/2 + 14/4
gradien -1/2
maka L1 dan L2 tegak lurus
b.y=2x +4
gradien = 2
2y = -3x +4
y = -3/2 x + 2
gradien -3/2
maka L1 dan L2 bersilangan
c.y= 2x + 4
gradien 2
4y = - 8x - 12
y = -2x - 3
gradien = - 2
maka L1 dan L2 bersilangan