Răspuns :
[tex]a+b=35/*2 \\ 2a+2b=70\\ 2b=2a+10 \\ 2a+2a+10=70 \\ 4a=70-10 \\ a=60:4 \\ a=15 \\ b=35-15=20[/tex]
a+b=35
2a=2b+10
2b+2b+10=35x2
4b+10=70
4b=70-10
4b=60
b=60:4
b=15
a+15=35
a=35-15
a=20
2a=2b+10
2b+2b+10=35x2
4b+10=70
4b=70-10
4b=60
b=60:4
b=15
a+15=35
a=35-15
a=20