We want to know the value of the expression:
[tex]40-9y[/tex]when y=2. For doing so, we will replace the value onto the expression, by multiplying it by 9, and then substracting to 40 the result. This is,
[tex]\begin{gathered} 40-9y=40-9(2) \\ =40-18 \\ =22 \end{gathered}[/tex]So, the value of the expression is 22.
