SOLUTION: I need a fast and easy way to understand how to solve expressions with variables using subtiution, so could you please give me examples and if possible help me understand these typ

You can put this solution on YOUR website!
I will see what I can do.
Let's begin with the 2 equations:
2x-y=1 eq.1
x =-3y+11 eq.2
We already know what x = in eaution 2, so we will substitute that for x in eq.1;
2(-3y+11)-y=1
Now distribute the 2;
-6y+22-y=1
Now add like terms;
-7y+22=1
subtract 22 from both sides;
-7y=-21
Divide both sides by -7;
y=3
Now that we know the answer for y, we can solve eq.1 and find what x=;
2x-3=1
2x=4
x=2
I hope you understand!!
=)