Question

7)Развязать систему уравнения:

Answer 1

$\displaystyle\left \{ {{3x-y=17} \ |\cdot3\atop {2x+3y=-7}} \right. \\\\\\+\displaystyle\left \{ {{9x-3y=51}\atop {2x+3y=-7}} \right.\\---------\\11x=44\\\\x=4\\\\y=3x-17=3\cdot 4-17=12-17=-5\\\\Otvet:\boxed{(4 \ ; \ -5)}$