[tex] \frac{y - y1}{y2 - y1} = \frac{x - x1}{x2 - x1} \\ \\ \frac{y - ( - 3)}{6 - ( - 3)} = \frac{x - 9}{12 - 9} \\ \\ \frac{y + 3}{9} = \frac{x - 9}{3} \\ \\ 9(x - 9) = 3(y + 3) \\ 9x - 81 = 3y + 9 \\ 9x - 3y - 81 - 9 = 0 \\ 9x - 3y - 90 = 0 \\ - - - - - - - - - \div 3 \\ 3x - y - 30 = 0[/tex]
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[tex] \frac{y - y1}{y2 - y1} = \frac{x - x1}{x2 - x1} \\ \\ \frac{y - ( - 3)}{6 - ( - 3)} = \frac{x - 9}{12 - 9} \\ \\ \frac{y + 3}{9} = \frac{x - 9}{3} \\ \\ 9(x - 9) = 3(y + 3) \\ 9x - 81 = 3y + 9 \\ 9x - 3y - 81 - 9 = 0 \\ 9x - 3y - 90 = 0 \\ - - - - - - - - - \div 3 \\ 3x - y - 30 = 0[/tex]