Question

2X plus Y equals 7 3X minus 4Y equals five

Answer 1

$\left \{ {{2x+y=7\ \ | *4} \atop {3x-4y=5}} \right. \\\\ \left \{ {{8x+4y=28} \atop {3x-4y=5}} \right. \\+----\\Addition\ method\\\\ 11x=33\ \ \ | divide\ by\ 11\\ x=3\\\\y=7-2x\\ y=7-2*3=7-6=1\\\\Solution:\\ \left \{ {{y=1} \atop {x=3}} \right.$