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3y - 5x + 4 = 0
3y = 5x - 4
y = 5/3x - 4/3
m = 5/3
y - 2x + 5 = 0
y = 2x - 5
m = 2
3x + 5y - 3 = 0
5y = -3x + 3
y = -3/5x + 3/5
m = -3/5
2x - y + 5 = 0
-y = -2x - 5
y = 2x - 5
m = 2
yang saling tegak lurus = 1 dan 3
pembuktian :
m1 . m2 = -1
5/3 . -3/5 = -1
-15 / 15 = -1
-1 = -1