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melewati x = 2 dan y = 2
maka
y - y1 / y2 - y1 = x - x1 / x2 - x1
y - 0 / 2 - 0 = x - 2 / 0 - 2
y / 2 = x - 2 / -2
(dikali silang)
y (-2) = 2(x - 2)
-2y = 2x - 4
-2x - 2y = -4
------------------- : (-1)
2x + 2y = 4
Atau
2x + 2y = 4
----------------- : 2
x + y = 2
Semoga membantu...