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x=-3
titik 1= 0,1
titik 2= -3,0
nanti tinggal dibuat garisnya
x +3 = 3y
3y = x +3
y = 1/3x +3/3
y = 1/3x +1
maka, m₁ = 1/3
m₁ . m₂ = -1
1/3 . m₂ = -1
m₂ = -1 per 1/3
m₂ = -3
y -y₁ = m(x -x₁)
y -3 = -3(x -4)
y -3 = -3x +12
y = -3x +12 +3
y = -3x +15
atau
3x +y -15 = 0