persamaan garis melalui titik (-2,7) dan tegak lurus garis y = 2x + 7

gradien garis y = 2x + 7 => 2
Tegak lurus maka m = -1/2

y - y1 = m(x-x1)
y-7    = -1/2 (x-(-2))
y-7 = -1/2 (x + 2)
y - 7 = -1/2x -1
y = -1/2x + 6

langsung aja yy

y = 2x + 7

2x - y + 7 = 0 tegak lurus (-2,7)

-x - 2y = -1.-2 - 2.7

-x - 2y = 2 - 14

-x - 2y = -12

x + 2y - 12 = 0

semoga berguna +_+