Algebra 2: what does x in the solution equal in the following system of equations

I've been having trouble with these problems, please help. Thank you!
I'm not really looking for a straight forward answer more of a guideline to help me solve these problems. So I can solve similar problems.
1.) what does x in the solution equal in the following system of equations?
-2x+y=5
y=2-x

2.) solve the following system of equations.
x+4y+3
3x+12y=5

3.) identify the solution to the inequality.
|5-3x|+3<7

4.) simplify the following expression
(√20+√8)(√5+√2)

5.) solve the following equation
^3√(x-3)+4=6

1.) what does x in the solution equal in the following system of equations?
-2x+y=5 eq1
y=2-x eq2

plug in y = 2 - x to eq1

- 2x + 2 - x = 5
- 3x = 5 - 2
- 3x = 3
x = - 1 answer//


2.) solve the following system of equations.
[x+4y = 3]3
[3x+12y=5]
---------------
3x + 12y = 9
-[3x + 12y = 5]
--------------------
...0 = 14 no solution for this equation//


3.) identify the solution to the inequality.
|5-3x|+3<7
|5 - 3x| < 7 - 3
|5 - 3x|<4
- 4 < 5 - 3x < 4
- 4 - 5 < - 3x < 4 - 5
- 9 < - 3x < - 1
3 > x > 1/3 answer//

4.) simplify the following expression
(√20+√8)(√5+√2)
=√(100) + √(40) + √(40) + √(16)
=10 + 2√(40) + 4
=10 + 2√(4 * 10) + 4
=10 + 4√(10) + 4
=14 + 4√(10)
=2[7 + 2√(10)] answer//

5.) solve the following equation

∛(x - 3) + 4 = 6
∛(x - 3) = 6 - 4
∛(x - 3)^3 = 2^3
x - 3 = 8
x = 8 + 3
x = 11 answer//

1.) what does x in the solution equal in the following system of equations?
-2x+y=5
y=2-x
2x+5=2-x
3x=-3
x=-1

2.) solve the following system of equations.
x+4y+3
3x+12y=5

3x+12y=12
3x+12y=5
no solution 12=5

3.) identify the solution to the inequality.
|5-3x|+3<7
|5-3x|<4
3+

4.) simplify the following expression
(√20+√8)(√5+√2)
no

5.) solve the following equation
^3√(x-3)+4=6
no