Question

Bantu saya ya kak...

Garis 2x-3y+a=0 melalui titik (2,7) tentukan nilai a!!

Answer 1

Langsung substitusikan x = 2 dan y = 7 ke persamaan.
2(2) - 3(7) + a = 0
4 - 21 + a = 0
-17 + a = 0
a = 17

Answer 2

Gradien = m
2x = 3y + a
x/y = 2/3

(y - y1) = m  (x - x1)
(y - 7) = 2/3 (x - 2)
3 (y - 7) = 2 (x - 2)
3y - 21 =  2x - 4
3y = 2x - 4 + 21
3y = 2x + 17