melalui titik (-2,-3) dan tegak lurus garis y = -x+5

y = -x +5
gradiennya = -1
gradien tegak lurusnya = -1 / (-1) = 1
y - (-3) = 1(x -(-2)
y + 3 = x +2
y = x - 1
Jadi persamaannya  y = x - 1

y=-x+5 m1 = -1 m1 x m2 = -1 -1 x m2 = -1 m2 = -1/-1 =1 y-y1 = m2 (x-x1) y-(-3) = 1 ( x- (-2) ) y+3 = 1 (x+2) y+3 = x + 2 y-x = -3 + 2 y-x = -1 y = x-1 -x =-y-1 -x+y+1=0