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5y = -ax + 10
y = -ax/5 + 2
m1 = -a/5
l = 3x - y - 6 = 0
y = 3x - 6
m2 = 3
tegak lurus = m1 × m2 = -1
-a/5 × 3 = -1
-3a/5 = -1
-3a = -5
a = 5/3