Persamaan garis yang melalui titik (1, 2) dan (1, 5) adalah…

(1 ,2) dan(1,5)
y-y1 per y2-y1 = x-x1 per x2 – x1
y-2 per 5-2 = x-1 per 1-1
y-2 per 3 = x-1
y-2 = 3(x-1)
y-2 = 3x-3
-3x+y-2+3=0
-3x+y+1=0.
maaf klau salah

Y-y1/y2-y1 = x-x1/x2-x1
y-2/5-2 = x-1/1-1
y-2/3 = x-1/0
0=3x-3
3=3x
1=x

D. x=1