2. If $x+2 y=14$ and $y=3$, what is the value of $2 x+3 y$ ?
2. Solution 1
Since $x+2 y=14$ and $y=3$, then $2 x+3 y=(2 x+4 y)-y=2(x+2 y)-y=2(14)-3=25$.
Solution 2
Since $x+2 y=14$ and $y=3$, then $x=14-2 y=14-2(3)=8$, and so $2 x+3 y=2(8)+3(3)=25$.
ANSWER: 25