Помогите!!!под а) б)

а) $\left \{ {{5x+2y=8} \atop {3x-y=7}|*2} \right. \\\left \{ {{5x+2y=8} \atop {6x-2y=14}} \right. \\\left \{ {{11x=22} \atop {6x-2y=14}} \right. \\\left \{ {{x=2} \atop {6*2-2y=14}} \right. \\\left \{ {{x=2} \atop {-2y=2}} \right. \\\left \{ {{x=2} \atop {y=-1}} \right.$

Ответ: (2;-1)

б) $\left \{ {{3x+4y=13} \atop {5x+2y=17}} \right. \\\left \{ {{3x+4y=13} \atop {-10x-4y=-34}} \right. \\\left \{ {{3x+4y=13} \atop {-7x=21}} \right. \\\left \{ {{9+4y=13} \atop {x=3}} \right. \\\left \{ {{4y=4} \atop {x=3}} \right. \\\left \{ {{y=1} \atop {x=3}} \right.$

Ответ: (3;1)