Question

sistemade equação do 1 grau +y=39 2x+4y=104

Answer 1

$y = 39 \\ 2x + 4y = 104 \\ 2x + 4 \times 39 = 104 \\ 2x + 156 = 104 \\ 2x = 104 - 156 \\ 2x = - 52 \\ x = \frac{ - 52}{2} \\ x = - 26$