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m1= -3/4 m2= 4/3
jadi
y-2= 4/3 (x+1)
y-2= 4/3x + 4/3
y - 4/3x = 4/3 + 2
---------------------- dikali 3 aja biar ga pecahan
3y - 4x = 10
m₁ = -a : b
= -3 : 4
= -3/4
Gradien kedua :
m₂ = -1 : m₁
= -1 : -3/4
= 4/3
Maka, persamaan garis yang tegak lurus :
y = m₂x - ( m₂x₁ - y₁ )
y = 4/3x - ( 4/3 × -1 - 2 )
y = 4/3x + 10/3
3y = 4x + 10
4x - 3y = -10