Question

resolva:
$x + y = 10 \\ 20 \times + 5y = 140$
me ajuda plssss​

Answer 1

$x + y = 10\\20x + 5y = 140\\\\\frac{20x + 5y}{5} = \frac{140}{5} \\4x + y = 28\\y = 28 - 4x\\\\x + (28 - 4x) = 10\\-3x = -18\\x = \frac{18}{3}\\x = 6\\\\6 + y = 10\\y = 4$