The first thing we see here (in the order of PEMDAS) is multiplication. Let’s multiply 2•2
4-2x+7
The next thing we see here (in the order of PEMDAS) is addition. Let’s add 4 and 7.
11-2x
We cannot simplify this anymore since -2x has a variable with it. Your final equation will be 11-2x, which is still equivalent to your original expression.
Hope this helps comment below for more questions :)
Slope is rise over run, if you count the rise (going left to right) it is -2, and for every -2 rise we run (move to the right) 1, so the slope is -2/1 or just -2