Question

Решите систему уравнений:
{4х-3у=12
{3х+4у=34

Answer 1

$left { {{4x-3y=12} atop {3x+4y=34}} right.$
$left { {{x=frac{12+3y}{4} } atop {3{ (frac{12+3y}{4} )+4y=34}} right.$
$36+9y+16y=34$
$25y=-2; y=-12,5$
$x= frac{12+3*(-12,5)}{4}=-6,375$