persamaan garis yg melalui titik a(-1,7) dan b(2,-3) adalah

(x1,y1)=(-1,7)
(x2,y2)=(2,-3)

[tex] \frac{y-y_1}{y_2-y_1} = \frac{x-x_1}{x_2-x_1}\\ \frac{y-7}{-3-7} = \frac{x-(-1)}{2-(-1)}\\ \frac{y-7}{-10} = \frac{x+1}{3}\\ 3(y-7)=-10(x+1)\\ 3y-21=-10x-10 \\10x+3y=-10+21\\ 10x+3y=11[/tex]