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y = (-3/5)x + 3
m = - 3/5
y - b = m(x - a)
y - 3 = (-3/5)(x - 2)
5y - 15 = - 3x + 6
3x + 5y - 21 = 0
L1//L2
garis l2 : 3x = 5y = 15
5y = -3x + 15
persaman garis lurus y = mx+c
3 = -3.2 + c
3 = 6 + c
3-6 + c
-3 = c
pers garis adalah 5y = -3x -3