Question

2x+y=105x-2y=22Qual é o valor de X e de Y?

Answer 1

{2X + y = 10..(2)
{5X - 2y= 22

4X + 2y = 20
5X - 2y = 22
__________
9X .........=42

X = 42
.......__..(÷3)
.........9

X =14
......__
.......3


2X + y = 10

2(14) + y = 20
...__
...(3)

28 + y = 20
__
.3

y = 20 - 28
..............___
................3

y = 60 - 28
......______
....... ....3

y = 32
.....___
.......3