melalui (2,3) tegak lurus y=2x+5

Garis yang tegak lurus dengan y = 2x + 5 memilki gradien :

[tex] m . 2 = -1 \\ m = \frac{-1}{2} [/tex]


[tex] m = \frac{y-y_1}{x-x_1} \\ \frac{-1}{2} = \frac{y-3}{x-2} \\ -1(x-2) = 2(y-3) \\ 2 - x = 2y - 6 \\ -2y - x = -8 \\ x + 2y = 8 [/tex]