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y -y₁ = x -x₁
y₂ -y₁ x₂ -x₁
y -(-2) = x -(-1)
0 -(-2) 0 -(-1)
y +2 = x +1
2 1
1(y +2) = 2(x +1)
y +2 = 2x +2
y = 2x +2 -2
y = 2x
Jadi, persamaannya adalah y = 2x.
( 0,0 ) dan ( -1,-2 )
y= -2 x = 2x
-1