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m = gradien
c = konstanta
garis yang melalui titik (6, -4) dan gradien = 1/3
y = mx + c
-4 = 1/3 . 6 + c
-4 = 2 + c
c = -6
persamaan garisnya adalah
y = 1/3 x + (-6)
y = 1/3 x - 6 ......... x 3
3y = x - 18
x - 3y - 18 = 0