persamaan garis yg melalui titik (1,2) dan titik (3,4) adalah tolongg jawab bsk di kumpulin!!

Diket :
x1 = 1
x2 = 3
y1 = 2
y2 = 4

Jawab :
y-y1/y2-y1 = x-x1/x2-x1
y-2/4-2 = x-1/3-1
y-2/2 = x-1/2
y-2 = x-1
y = x-1+2
y = x+1

y-y1 x-x1
------- = -------
y2-y1 x2-x1

y-2 x-1
-------- = -----
4-2 3-1

y - 2 = x -1
2 2

2(x-1) = 2(y-2)
2x -2 = 2y -4
2y = 2x + 2
y = x + 1