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x1,y1 = -1 , 0
x2,y2 = 0 , 2
persamaan garis a
y - y1 / y2 - y1 = x - x1 / x2 - x1
y / 2 = x + 1 / (-1)
y = -2x + 2
jadi m garis a = -2
garis b tegak lurus dengan garis a
jadi m garis b = -(1/m)
= -(1/(-2))
= 1/2
garis b melewati titik (-1,0)
y = mx + c
0 = (1/2) x (-1) + c
0 = (-1/2) + c
c = 1/2
jadi persamaannya:
y = mx + c
y = 1/2x + 1/2 ==> dikali dua semua jadinya,,,
2y = x + 1 (jawaban yang C)