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=-2/-1
m1 =2
m1tegak lurus dngn m2
m2=-1/2
y-y1=m(x-x1)
y-(-1)=-1/2(x-5)
y+1=-1/2(x-5)
2y+2=-x+5
x+2y=5-2
x+2y=3
atau blh jga x+2y-3=0
m₁ = -a : b
= -2 : -1
= 2
Gradien kedua :
m₂ = -1 : m₁
= -1 : 2
= -1/2
Maka, persamaan garis yang tegak lurus :
y = m₂x - ( m₂x₁ - y₁ )
y = -1/2x - ( -1/2 × 5 + 1 )
y = -1/2x + 3/2
2y = -x + 3
x + 2y = 3