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2x +5 = y
y = 2x +5
Maka, m₁ = 2
m₁ . m₂ = -1
2 . m₂ = -1
m₂ = -1/2
y -y₁ = m(x -x₁)
y -(-2) = -1/2(x -3)
y +2 = -1/2x +3/2 dikali 2 untuk menghilangkan penyebut, sehingga
2y +4 = -x +3
2y = -x +3 -4
2y = x -1
x -2y -1 = 0
m2=-1/2
y+2= -1/2 (x-3)
y+2=-1/2x+ 1,5
0,5x+y+0,5=0
atau
x+2y+y=0