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y -y₁ = x -x₁
y₂ -y₁ x₂ -x₁
y -(-4) = x -(-2)
2 -(-4) 1 -(-2)
y +4 = x +2
6 3
3(y +4) = 6(x +2)
3y +12 = 6x +12
3y = 6x +12 -12
3y = 6x
y = 6/3x
y = 2x.
Jadi, persamaan garisnya adalah y = 2x.