Could use some help setting this up please. Medal.
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Eng rate = 60/hr
total = 625
astnt hours = eng hours -4
Like @creeksider showed you, you can model all of that with two equations: 1 for the total cost (eng rate x eng time + astnt rate x astnt time) 1 for the relationship between the eng time and the astnt's time.
ok so the first formula
625 = 60E + 10A
625 is number job cost got that and 60 is how much money engineer makes per hour E being his hours so fourth with assistant
now second formula A is hours assisted worked while E is hours engineer worked and we subtract it by 4 because the assistant worked less then 4 hours.
I am not sure how to start next step, multiple -60E to get rid of the hours worked by engineer?
Since the 2nd equation is already "A=...." you can just substitute that expression for A into the first equation, where you have the A.
Then you get 1 equation in 1 unknown (E) which you can solve for that variable.
Then substitute the value for E back into either of the equations (the 2nd one is the simplest) to get the value for A.
so he worked 9.5 hours? Meaning the assistant worked 5.5 hours?
Check it yourself to see if this is the right answer. What would the customer be billed if the engineer worked 9.5 hours at $60 per hour, and the assistant worked 5.5 hours at $10 per hour?