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x₁= 1 y₁= -2
m₂= 3
y-y₁= m₂(x-x₁)
y-(-2)= 3(x-1)
y + 2= 3x - 3
y= 3x - 3 - 2
y= 3x - 5
atau
3x - y - 5= 0
Jadi, persamaan garisnyaadalah y= 3x - 5 atau 3x - y - 5= 0.
m = 3
x1 = 1
y1 = -2
y - y1 = m (x - x1)
y - (-2) = 3 (x - 1)
y + 2 = 3x - 3
y = 3x - 3 - 2
y = 3x - 5