persamaan garis yang melalui titik P (-1,2) Q(-2,-2)

[tex] \frac{y - y1}{y2 - y1} = \frac{x - x1}{x2 - x1} \\ \frac{y - 2}{ - 2 - 2} = \frac{x - ( - 1)}{ - 2 - ( - 1)} \\ \frac{y - 2}{ - 4} = \frac{x + 1}{ - 1} \\ - 1(y - 2) = - 4(x + 1) \\ - y + 2 = - 4x - 4 \\ 4x - y + 2 + 4 = 0 \\ 4x - y + 6 = 0[/tex]