Chapter 8.1, Problem 28E

To determine

To evaluate:

The givenexpression, when $x=-5$ and $y=-7$ .

Answer to Problem 28E

The value of given expression would be $8$ .

Explanation of Solution

Given:

An expression: $y-x+10$

Calculation:

To find the value of the given expression, we will substitute $x=-5$ and $y=-7$ in our given expression as shown below:

  $\begin{array}{l}y-x+10\left(\text{Given expression}\right)\\ \Rightarrow -7-(-5)+10\left(\text{Substituting given values}\right)\\ \Rightarrow -7+5+10\left(\text{Using property (}-)(-)=(+)\right)\\ \Rightarrow 8\end{array}$

Therefore, the value of given expression would be $8$ .