The first problem is true because with multiplication it doesn't matter which order it is in.
The second problem is false because you will get a different quotient depending on which numbers are on which side of the equation.
X/-3 = 12 + x
x = -36 - 3x
4x = 36
x= = 9
The number is 9.
<h2>
Explanation:</h2>
Here we have the following expression:

So we need to extend this. Remember that the difference of squares tells us:

So here:

Thus:

Okay, so I'm almost positive the slope is m=1/1. I know this because the line rises one and runs one.
Answer:

or 
Step-by-step explanation:
Given

Using Completing the Square
---- Add
to both sides


Divide the coefficient of x by 2; then add the square to both sides



Factorize




Hence, the equation is 
Solving further
Take square root of both sides



This implies that
or 
or 
HEnce, the solutions are
or 