Ignore the part where i tried to solve solve each equation and check the solution to make sure it works in the original equation

You have done question 4 correctly, so good job for that one. 
Question 8:
The squaring bit is right. 
4x - 4 = x
Add four to both sides
4x = x+4
Subtract (1) x from both sides
3x = 4
divide everything by 3
x = 4/3 or 1.3r
Just ask if anything is unclear

200 miles.45 x 3 (charge per day times days)135$205$ - 135$ = 70$0.35x = 70divide both sides by 0.35200