# How do you evaluate 5x+2z if w=6, x=0.4, y=1/2, z=-3?

Mar 14, 2017

See the entire solution process below:

#### Explanation:

To evaluate the expression we need to substitute $\textcolor{red}{0.4}$ for $\textcolor{red}{x}$ and $\textcolor{b l u e}{- 3}$ for $\textcolor{b l u e}{z}$ in the expression and then calculate the result. Variables $w$ and $y$ are not used and not necessary for this problem:

$5 \textcolor{red}{x} + 2 \textcolor{b l u e}{z}$ becomes:

$\left(5 \cdot \textcolor{red}{0.4}\right) + \left(2 \cdot \textcolor{b l u e}{- 3}\right) \to$

$2 + \left(- 6\right) \to$

$2 - 6 \to$

$- 4$