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m₁ = -a : b
= -2 : -1
= 2
Gradien tegak lurus :
m₂ = -1 : m₁
= -1 : 2
= -1/2
Maka, persamaan garis yang tegak lurus :
y = mx - ( mx₁ - y₁ )
y = -1/2x - ( -1/2 × 5 + 1 )
y = -1/2x + 7/2
2y = -x + 7
x + 2y = 7