Given data:
The given cost of 1 book is $7.
The expression for the given statement is,
1 book =$7
Multiplly the above expression by 2 on both sides.
[tex]\begin{gathered} 2(1\text{ book)= 2(\$7)} \\ 2\text{ books=\$14} \end{gathered}[/tex]Thus, the cost of 2 books is $14.
