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M1 x M2 = -1
gradien garis x+3y+2=0 adalah -1/3
berarti gradien M2 nya harus 3. otomatis, a = 6.
rumus gradien dari ax + by + c = 0 adalah -a/b
m₁ = -a/b = -1/3
m₁×m₂ = -1
-1/3 × m₂ = -1
m₂ = -1 : -1/3
= 3
m₂ = -a/b
3 = -a/3
-a = 3×3
a = -9
nilai a = -9