Question

2x+3y=7метод сложения
7x-3y=6
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X+3y=13
2x+y=6

Answer 1

1.

$\left \{ {{2x+3y=7} \atop {7x-3y=6}} \right. \\\\ \left \{ {{9x=13} \atop {2x+3y=7}} \right. \\ \\ \left \{ {{x=\frac{13}{9}} \atop {2*\frac{13}{9}+3y=7}} \right. \\ \\ \left \{ {{x=\frac{13}{9}} \atop {y=\frac{37}{27}}} \right.$

2.

$\left \{ {{x+3y=13} \atop {2x+y=6 }} \right. \\ \\ \left \{ {{x+3y=13} \atop {-6x-3y=-18 }} \right.\\ \\ \left \{ {{-5x=-5} \atop {x+3y=13}} \right. \\ \\ \left \{ {x=1} \atop {1+3y=13}} \right. \\ \\ \left \{ {{x=1} \atop {y=4}} \right.$