Answer:
Base Fee = $7
Extra charges = $7
Step-by-step explanation:
Represent the base charge with x and the additiional charges with y.
For the 5 hours job, we have:

For the 3 hour job

Solving for x and y;


Subtract the second equation from the first


Solve for y


Substitute 7 for y n the first equation





Step-by-step explanation:
The value of x can be written in terms of W only since both are variable
Hence the value of X=W/2 as the question