Question

Daca 2a+b=7,aflati 4a+1+2b

Answer 1

4a+1+2b=(4a+2b)+1=2(2a+b)+1=2*7+1=15.

Answer 2

[tex]2\cdot a+b=7 \\ 4a+1+2b=2\cdot\underline{(2\cdot a+b)}+1=2\cdot 7+1=15.[/tex]