Question

Tentukan persamaan garis yang melalui
a. A(5,3) dan B(3,7)
b. P(5,4) dan Q(8-7)
pakai cara!

Answer 1

Gunakan (x2-x1) (y-y1) = (y2-y1) { x- x1)
1)
(x1,y1)= (5,3)
(x2,y2) = (3,7)
 (3-5)(y-3) = (7-3)(x-5)
-2(y-3) = 4(x-5)
-2y +6 = 4x - 20
4x + 2y - 20 - 6= 0
4x + 2y - 26 = 0
atau 
2x + y - 13 = 0
.
2)
x1,y1 = 5,4
x2,y2 = 8, - 7
(8-5)(y-4) = (-7-4)(x-5)
3(y-4) = -11(x-5)
3y -12 = -11x + 55
11 x + 3y - 12 - 55 = 0
11 x + 3y - 67 = 0