Question

I need help with 31 need know how solve it and steps

Answer 1

First, you substitute x with 10 (recall that when -8x means -8 times x)
$\frac{ - 8(10) + 9}{ - 9 + 10}$
For the numerator (the top), you use PEMDAS (first multiply -8 and 10, then add 9):

$\frac{ - 80 + 9}{ 1}$
When the denominator (the bottom) is 1, you can just write the numerator:

-80 + 9

That equals - 71