Question

ajudem: ×+y=5
×-3y=-3

Answer 1

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

3x +3y =15
x -3y = -3

4x= 12
x= 12/4
x=3



x+y=5
3+y=5
y= 5-3
y= 2


S {3,2}

Answer 2

x + y = 5   
x - 3y = -3 * (-1)

x + y = 5
-x + 3y = 3

4y = 8
y = 8/4
y = 2

x + y = 5
x + 2 = 5
x = 5 - 2 
x = 3

Resposta: x = 3 e y = 2.