Persamaan garis yg melalui titik(2,-5) dan (-6,9) adalah

y-y₁ = x-x₁
y₂-y₁     x₂-x₁

y-(-5) = x-2
9-(-5)      -6-2

y+5 =   x-2
 14        -8

14(x-2) = -8(y+5)
14x-28 = -8y-40
14x+8y = -40+28
14x+8y = -12
14x+8y+12 = 0
7x+4y+6 = 0