1/2 x - y = - 7 1/3 x + 1/2 y = 0 brp ya kira kira tolong gan jawabannya

jawab

1/2 x - y = - 7 ..} kali 2
x - 2y = - 14
x = 2y - 14 ...(i)

1/3x + 1/2 y = 0 ...}kali 6
2x + 3y = 0....(ii)

(i) subs ke (ii)
2 x  + 3y = 0
2(2y -14)  + 3y = 0
4y - 28 + 3y = 0
7y = 28
y = 4

x  = 2y -7
x = 2(4) - 7
x = 1

(x,y)  = (1, 4)