Question

Срочно надо плиз!!!

Answer 1

1)y=5-x 2)x=4-y 3)3y=-1-2x

x-(5-x)=7 3(4-y)-5y=20 y=(-1-2x)/3

x+x-5=7 12-3y-5y=20 3x+5(-1-2x)/3=-2

2x=12 -8y=8 3x-5/3-10x/3=-2

x=6 y=-1 (9x-5-10x)/3=-2/×3

y=5-6=-1 x=4+1=5 -x-5=-6

-x=-1

x=1

y=(-1-2)/3=-3/3=-1

4)x=6-3y

4(6-3y)-9y=3

24-12y-9y=3

24-21y=3

21y=21

y=1

x=6-3=3