Question

{X-3y=-3. 5x-3y=9. Решите систему уравнений способом подстановки.
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Answer 1

$\left \{ {{x - 3y = -3} \atop {5x - 3y = 9}} \right. \left \{ {{x = -3+3y} \atop {5(-3+3y) - 3y = 9}} \right. \left \{ {{x=-3+3y} \atop {-15+12y=9}} \right. \left \{ {{x = -3+3*2} \atop {y = 2}} \right. \left \{ {{x = 3} \atop {y=2}} \right.$