Question

Решить систему уравнений способом сложения​

Answer 1

Ответ:

(2;1)

Объяснение:

$\displaystyle\\\\\left \{ {{2.5(x-3y)-3=-3x+0.5} \atop {3(x+6y)+4=9y+19}} \right.\\\\\\\left \{ {{2.5x-7.5y-3=-3x+0.5} \atop {3x+18y+4=9y+19}} \right.\\\\\\\left \{ {{2.5x-7.5y-3+3x-0.5=0} \atop {3x+18y+4-9y-19=0}} \right. \\\\\\\left \{ {{5.5x-7.5y-3.5=0} \atop {3x+9y-15=0}} \right.\\\\\\\left \{ {{55x-75y-35=0}\ \ \ \ |:5 \atop {x+3y-5=0\ \ \ \ \ \ \ \ \  |*5}} \right.\\\\\\\left \{ {{11x-15y-7=0} \atop {5x+15y-25=0}} \right.\\\------------\\16x-32=0\\\\x=2\\\\11*2-15y-7=0\\\\15y=15\\\\y=1$

Ответ: (2;1)

Answer 2

Ответ: во вложении Объяснение: