Question

Решить систему уравнений 2x - 5y = -7 x - 3y = -5

Answer 1

$\left \{ {{2x-5y=-7} \atop {x-3y=-5}} \right. \\ \left \{ {{2x-5y=-7} \atop {x=3y-5}} \right. \\ 2(3y-5)-5y=-7 \\ 6y-10-5y=-7 \\ y=3 \\ y=3 \\ x=3y-5=3*3-5=9-5=4 \\ OTBET:(4;3)$

Answer 2

$\left \{ {{2x-5y=-7} \atop {x-3y=-5}/*(-2)} \right. \\ \left \{ {{2x-5y=-7} \atop {-2x+6y=10}} \right. \\ y=3 \\ 2x-15=-7 \\ 2x=-7+15\\2x=8\\x=4$

ответ: х=4
у=3