Question

Persamaan garis yang melalui titik (-3,-1) dan (1,7) adalah..

Answer 1

(-3,1) --> (x1,y1)
(1,7) --> (x2,y2)

y-y1/y2-y1 = x-x1/x2-x1
y-1/7-1 = x-(-3)/1-(-3)
y-1/6 = x+3/4
4.(y-1) = 6.(x+3) (bagi 2 kedua ruas)
2.(y-1) = 3.(x+3)
2y-2 = 3x+9
2y = 3x+9+2
2y = 3x+11
0 = 3x-2y+11

Answer 2

Y-y1/y2-y1 = x-x1/x2-x1
y-(-1)/7-(-1) = x-(-3)/1-(-3)
y+1 / 8 = x+3 / 4
4y+4=8x+24
4y-8x+4-24=4y-8x-20 (dibagi 4)
y-2x-5=0