Question

Evaluate the expression when a= 4 and b= -7.
-9a+b

Answer 1

We simply just substitute the values into the equation
-9(4)+-7
Which is -43

Answer 2

-43

Explanation:

So first things first you will multiply -9 by 4 and that gives you -36, Next you will add -7 to -36 which gives you -43.

`-9(4)+(-7)\\-36+(-7) \\= -43`

Hope this helps :D