mohon jawabannya kakak :) a. y=-x+1 b. y=2x-1 c. y=-2x-1 d. y=x+1

x1=1, y1=2, x2=3, y2=4
y-y1 / y2-y1 = x-x1 / x2-x1
y-2 / 4-2 = x-1 / 3-1
y-2 / 2 = x-1 / 2
2(y-2) = 2(x-1)
2y-4 = 2x-2
2y = 2x + 2
y = x + 1 / (d)