Question

Resolva o sistema
[x+y=7]
[3x-y=5]

Answer 1

Resposta:

[x + y = 7]

[3x - y = 5]

4x = 12

x = 12 / 4

x = 3

x + y = 7

3 + y = 7

y = 7 - 3

y = 4

x = 3

y = 4

Prova real:

x + y = 7

3 + 4 = 7

3x - y = 5

3.3 - 4 = 5

9 - 4 = 5