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y - y₁ x - x₁
_____ = ______
y₂ - y₁ x₂ - x₁
y - (-3) x - (-2)
______ = ________
3 - (-3) 4 - (-2)
y + 3 x + 2
_____ = ______
3 + 3 4 + 2
y + 3 x + 2
_____ = ______
6 6
6 (y + 3) = 6 (x + 2)
6y + 18 = 6x + 12
y + 3 = x + 2
y = x + 2 - 3
y = x - 1
gradien garis y = mx + c adalah m
Berarti, gradien garis y = x - 1 adalah 1
Jadi, gradien garisnya adalah 1