persamaan garis melalui titik (7,-4)dan (9,6) adalah

[tex] \frac{X-X1}{X2-X1} = \frac{Y-Y1}{Y2-Y1} [/tex]
[tex] \frac{x-7}{9-7} = \frac{y-(-4)}{6-(-4)} [/tex]
[tex] \frac{x-7}{2} = \frac{y+4}{10} [/tex] kali silang
10x-70=2y+8
10x-2y-78=0