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y -1 = 3(x -(-2))
y -1 = 3x +6
y = 3x +6 +1
y = 3x +7
Jadi, persamaannya adalah y = 3x +7.
y₁ = 1
m = 3
y - y₁ = m ( x - x₁)
y - 1 = 3 ( x - (-2) )
y - 1 = 3 ( x + 2 )
y - 1 = 3x + 6
-3x + y = 6 + 1
-3x + y = 7
3x - y = -7