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3x + 4y = 17 ---> x 2
6x + 9y = 36
6x + 8y = 34
_________-
y = 2
2x + 3y = 12
2x + 3(2) = 12
2x + 6 = 12
2x = 12 - 6
x = 6/2
x = 3
Melalui titik (3, 2)
syarat sejajar m₁ = m₂
3x - 5y = 15
-5y = -3x + 15
y = 3/5 x - 3
m = 3/5
y - y₁ = m(x - x₁)
y - 2 = 3/5 (x - 3)
5(y - 2) = 3(x - 3)
5y - 10 = 3x - 9
-3x + 5y = -9 + 10
-3x + 5y = 1