Question

me ajudem pfvr!.....​

Answer 1

Resposta:

$x + y = 48 \\ x - y = 10 \\ \\ x = 48 - y \\ 48 - y - y = 10 \\ - 2y + 48 - 10 = 0 \\ - 2y + 38 = 0 \\ - 2y = - 38 \times ( - 1) \\ 2y = 38 \div (2) \\ y = 18 \\ \\ x = 48 - y \\ x = 48 - 18 \\ x = 30 \\ \\ (x.y) = (30.18)$

$4x - 2y = 8 \\ - 4x - 20y = 36 \\ \\ 4x = 8 + 2y \\ - (8 + 2y) - 20y = 36 \\ - 8 - 2y - 20y = 36 \\ - 22y - 8 - 36 = 0 \\ - 22y - 44 = 0 \\ - 22y = 44 \times ( - 1) \\ 22y = - 44 \div (22) \\ x = - 2 \\ \\ 4x = 8 + 2y \\ 4 \times ( - 2) = 8 + 2y \\ - 8 - 8 - 2y = 0 \\ - 2y - 16 = 0 \\ - 2y = 16 \times ( - 1) \\ 2y = - 16 \div (2) \\ y = - 8 \\ \\ (x.y) = ( - 2. - 8)$