Question

Resolva pelo método que julgar adequado

Answer 1

$\left \{ {{2x + y=1} \atop {5x + 3y = 7}} \right. \\\\ y = 1 - 2x\\\\\\ 5x + 3 * (1-2x) = 7\\\\ 5x + 3 - 6x = 7\\\\ -x = 7 - 3\\\\ -x = 4\\\\ x = -4\\\\\\y = 1-2*(-4)\\\\y=1+8\\\\y = 9$