Question

8x-5y evaluate x= 4 and y = -9

Answer 1

We are given the following expression:

$8x-5y$

We are asked to evaluate the expression at;

$\begin{gathered} x=4 \\ y=-9 \end{gathered}$

To determine the numerical value of the expression at the given points we will substitute the values, like this:

$8(4)-5(-9)$

Now, we solve the products:

$8(4)-5(-9)=32+45$

Now, we solve the addition:

$32+45=77$

Therefore, the value of the expression is 77.