Question

решите системe уравнения а)x+y=7
5x-3y=11

Answer 1

$begin{cases}x+y=7|*3\5x-3y=11end{cases}<=>begin{cases}3x+3y=21\+\5x-3y=11end{cases}\\. 8x=32\. x=4\x+y=7=>y=7-x=3\OTBET:(4;3)$