Tolong dibantu no 19 aja

koordinat: (2,0)
gradien tegak lurus:
-4/2 x m= -1
m = -1 x 2/-4
m=-2/-4(sederhanakan)
m=1/2

y-y1 =m (x-x1)
y-0 = 1/2 (x-2)
y-0 = 1/2x-1
-------------------x2
2y-0 = x -2
2y-x=-2