Question

{x+y=5
{x-y=1
me ajudem

Answer 1

{x + y = 5 (x = 5 - y)

{x - y = 1

x - y = 1

5 - y - y = 1

-2y = 1 - 5

-2y = -4 (-1)

2y = 4

y = 4/2

y = 2

x + 2 = 5

x = 5 - 2

x = 3