Реши систему уравнений: {2x−y=5x−1,5y=18 помогите

Объяснение:

$1)2x - y = 18 \\ 2)5x - 1.5y = 18 \\ 1)2x - y = 18 \\ 2)50x - 15y = 180 \\ 1) - 50x + 25y = - 450 \\ 2)50x - 15y = 180 \\ 10y = - 270 \\ y = - 27 \\ 2x - ( - 27) = 18 \\ x = - \frac{9}{2} \\ (x.y) = ( - \frac{9}{2} . - 27) \\ 2 \times ( - \frac{9}{2} ) - ( - 27) = 5 \times ( - \frac{9}{2} ) - 1.5 \times \times ( - 27) = 18 \\ 18 = 18 = 18$