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y = -2x + 4
y = mx + c
m = -2
y - b = m(x - a)
y - 5 = -2(x - 4)
y - 5 = -2x + 8
y = -2x + 8 + 5
y = -2x + 13
atau
y + 2x = 13
atau
y + 2x - 13 = 0