Question

Resolva pelo método de adição. 3x+y=5 2x+y=4​

Answer 1

$\Large\boxed{\begin{array}{l}\begin{cases}\sf 3x+y=5\\\sf2x+y=4\cdot(-1)\end{cases}\\\\\begin{cases}\sf3x+y=5\\\sf-2x-y=-4\end{cases}\\\sf x=1\\\sf 2\cdot1+y=4\\\sf 2+y=4\\\sf y=4-2\\\sf y=2\\\sf S=\{1,2\}\end{array}}$