tolong dibantu ya...beserta caranya trimakasii

diketahui =
x1 = -3
x2 = 2
y1 = 4
y2 = -1

ditanya =
pers. garis ??

[tex] \frac{y - y1}{y2 - y1} = \frac{x - x1}{x2 - x1} \\ \: \frac{y - 4}{ - 1 - 4} = \frac{x - ( - 3)}{2 - ( - 3)} \\ \: \: \: \: \frac{y - 4}{ - 5} = \frac{x + 3}{5} \\ 5(y - 4) = - 5(x + 3) \\ \: 5y - 20 = - 5x - 15 \\ 5y = - 5x - 15 + 20 \\ 5y = - 5x + 5 \\ \: \: y = \frac{ -5x + 5 }{5} \\ \: \: y = - x + 1 \\ x + y = 1[/tex]
semoga membantu