Question

3× + y = 7
2× - 5y = 16

Answer 1

Resposta:

Explicação passo-a-passo:

3× + y = 7  *(5)

2× - 5y = 16     =>    

15× + 5y = 35

2× - 5y = 16

____________

17x         = 51

x = 51/17

x = 3

Answer 2

y = 7 - 3x

2x - 5(7 - 3x) = 16
2x - 35 + 15x = 16
17x = 16 + 35
x = 51/17 —> x = 3

3(3) + y = 7
y = 7 - 9
y = -2