Question

ПОМОГИТЕ!!! Я не могу это решить​

Answer 1

Ответ:

a) 3+2x+5x=10

x=1

y=3+2*1

y=5

б) 3(2+y)-2y=9

y=3

x=2+3

x=5

в) 2(1-y/2)-3y=-6

y=2

x=1-2/2

x=0

Объяснение:

Answer 2

$1)left { {{y=3+2x} atop {y+5x=10}} right.\\left { {{y=3+2x} atop {3+2x+5x=10}} right.\\left { {{y=3+2x} atop {7x=7}} right.\\left { {{x=1} atop {y=3+2*1}} right.\\left { {{x=1} atop {y=5}} right. \\Otvet:boxed{(1;5)}\\\2)left { {{x=2+y} atop {3x-2y=9}} right.\\left { {{x=2+y} atop {3*(2+y)-2y=9}} right.\\left { {{x=2+y} atop {6+3y-2y=9}} right.\\left { {{x=2+y} atop {y=3}} right.$

$left { {{x=2+3} atop {y=3}} right.\\left { {{x=5} atop {y=3}} right.\\Otvet:boxed{(5;3)}\\\3)left { {{2x-3y=-6} atop {3x+1,5y=3}} right.\\left { {{x-1,5y=-3} atop {3x+1,5y=3}} right. \\left { {{1,5y=x+3} atop {3x+x+3=3}} right.\\left { {{1,5y=x+3} atop {4x=0}} right.\\left { {{x=0} atop {1,5y=3}} right.\\left { {{x=0} atop {y=2}} right.\\Otvet:boxed{(0;2)}$