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m = -4/-3
m = 4/3
jika tegak lurus maka
m2 = -1/m1
m2 = -3/4
persamaan garis lurus
y-y1 = m(x-x1)
y-1 = -3/4(x+2)
4(y-1) = -3(x+2)
4y-4 = -3x -6
4y = -3x -6 +4
4y = -3x -2
m = - a/b
m = 4/3
Karena tegak lurus, maka gradiennya berbeda deengan hasil kali -1 :
m₂ = -1 : m
= -1 : 4/3
= -3/4
Lalu, kita cari persamaan garisnya :
y = m₂x - ( m₂x₁ - y₁ )
y = -3/4x - ( 3/2 - 1 )
y = -3/4x - 1/2
y = -3/4x - 2/4
4y = -3x - 2
3x + 4y + 2 = 0