Question

3. Determine x e y tais que:​

Answer 1

$x + y = 4\\x - y = 2 \longrightarrow x = 2 + y \\\\x + y = 4\\(2 + y) + y = 4\\2+ 2y = 4\\2y = 4 - 2 \\2y = 2\\\boldsymbol{y = 1}\\\\x - y = 2\\x - 1 = 2\\\boldsymbol{x = 3}$