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y = - 2x + 1/2
m₁ = - 2
m₂ = 1/2
titik potong:
x + y = 2
x - 2y = 5
________ -
3y = - 3
y = - 1
x = 3
Persamaan garis melalui (3,-1) dan m = 1/2 adalah:
y - b = m(x - a)
y + 1 = (1/2)(x - 3)
2y + 2 = x - 3
x - 2y - 5 = 0