Question

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

Answer 1

`\huge\text{Hey there!}`

`\mathsf{8x - 5y}\\\mathsf{= 8(4) - 5(-9)}\\\mathsf{= 32 - (-45)}\\\mathsf{= 32\ \boxed{\bf +}\ 45}\\\mathsf{= 77}\\\\\\\huge\text{Therefore your answer should be:}\\\\\huge\boxed{\mathsf{77}}\huge\checkmark`

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Answer 2

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.