Question

Tolong dibantu ya yang master matematika, no 19. Please besok ulangan, Tolong pakai cara ya, terima kasih

Answer 1

X + y = 3
x = 3 - y

2x - y = 0
2(3-y) - y = 0
6 - 2y - y = 0
6 - 3y = 0
6 = 3y
2 = y

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