Question

Como resolver A) x-2y=0 x+y=6
B) 5x+y=3
X+2y=15

Answer 1

a)

x - 2y = 0 → x - 2y = 0 → 3x = 12 → x = 4
x + y = 6 2x +2y = 12

x - 2y = 0 → 4 -2y = 0 → y = -4/-2 → y = 2


x = 4 e y = 2


b)

5x + y = 3 → -10x - 2y = -6 → -9x = 9 → x = -1
x + 2y = 15 x + 2y = 15

5x + y = 3 → 5(-1) - 3 = -y → y = 5 + 3 → y = 8


x = -1 e y = 8