# How do you evaluate the expression x+8y when y=7 and x=4?

Nov 20, 2016

The answer is $60$.
Evaluate $\textcolor{red}{x} + 8 \textcolor{\lim e g r e e n}{y}$ when $\textcolor{\lim e g r e e n}{y} = \textcolor{\lim e g r e e n}{7}$ and $\textcolor{red}{x} = \textcolor{red}{4}$
Substitute $\textcolor{red}{4}$ for $\textcolor{red}{x}$ and $\textcolor{\lim e g r e e n}{7}$ for $\textcolor{\lim e g r e e n}{y}$.
$\textcolor{red}{x} + 8 \textcolor{\lim e g r e e n}{y} = \textcolor{red}{4} + 8 \left(\textcolor{\lim e g r e e n}{7}\right) = 4 + 56 = 60$