СРОЧНОООООООО ИМЕННО СЛОЖЕНИЕМ))

А)
$2x + 3y = 13 \\ 4x - y = 5 \\ \\ 2x + 3y = 13 \\ 12x - 3y = 15 \\ \\ 14x = 28 \\ y = 4x - 5 \\ \\ x = 2 \\ y = 4x - 5 \\ \\ x = 2 \\ y = 3$
Ответ: (2; 3)

б)
$3x - 2y = 7 \\ - 4x + 3y = - 7 \\ \\ 9x - 6x = 21 \\ - 8x + 6y = - 14 \\ \\ x = 7 \\ y = \frac{3x - 7}{2} \\ \\ x = 7 \\ y = 7$
Ответ: (7; 7)

в)
$\frac{x}{2} + \frac{y}{3} = 2 \\ 2x - 3y = - 5 \\ \\ 3x + 2y = 12 \\ 2x - 3y = - 5 \\ \\ 9x + 6y = 36 \\ 4x - 6y = - 10 \\ \\ 13x = 26 \\ y = \frac{2x + 5}{3} \\ \\ x = 2 \\ y = \frac{2x + 5}{3} \\ \\ x = 2 \\ y = 3$
Ответ: (2; 3)