Question

решите систему уравнений 2х+у=10, 5х=3у+14

Answer 1

$left { {{2x+y=10} atop {5x=3y+14}} right. \left { {{x=frac{10-y}{2} } atop 5(frac{10-y}{2})=3y+14  |*2 }} right.\left { {{x=frac{10-y}{2} } atop {5(10-y)=6y+28}} right.\left { {{x=frac{10-y}{2} } atop {50-5y=6y+28}} right.\left { {{x=frac{10-y}{2} } atop {11y=22|:11}} right.\left { {{y=2} atop {x=frac{10-2}{2} }} right.\left { {{y=2} atop {x=frac{8}{2} }} right.\left { {{x=4} atop {y=2}} right.$

Answer 2

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