Question

podem me ajudar com as questões na foto pfv​

Answer 1

$x + y =5 \\ 2x - y = 9 \\ \\ - 1x + y = 5 \\ 2x -y = 9 \\ \ - 1x = 14 \div 1 \\ x = 14 \\ \\ x + y = 5 \\ 14 \times 5 + y = 5 \\ y = 70 - 5 = \\ y = 65$

$3x - y = 10 \\ x + y =18 \\ 4x = 28 \div 4 \\ x = 7 \\ \\ x + y = 18 \\ 7 \times 18 + y = 18 \\ y = 126 - 18 \\ y = 108$