Question

rozwiąż 2 równania 1 lub 2 metoda:

2x-y+18=x+y-1

2x-y+18=x=y-1+3y-x+1=70

x+y+1=3x-x+1

x+y+1+3y-x+1+2x-y+18=70

Answer 1

2a)   x+y+1=3y-x+1+2x-y+18/+x

2x+y+1=3y+1+2x-y+18/-2x

y+1=3y+1+-y+18

y+1=2y+1+18/-y

1=y+1+18/-18

-17=y+1/-1

y=(-18)

 

1a)   2x-y+18= x+y-1/+1

2x-y+19=x+y/-x

x-y+19=y/-y

x+19=0/-19

x=-19