SOLUTION: A locksmith charges $40 plus $28 for each lock installed. How many locks can be replaced for $236?

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Question 158173: A locksmith charges $40 plus $28 for each lock installed. How many locks can be replaced for $236?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Since the "locksmith charges $40 plus $28 for each lock installed", this means that the cost equation is c=28x%2B40 (note: plug in some values of x so that you have some examples)


c=28x%2B40 Start with the given equation


236=28x%2B40 Since the cost is $236, this means that we need to plug in c=236


236-40=28x Subtract 40 from both sides


196=28x Combine like terms.


196%2F28=x Divide both sides by 28 to isolate x


7=x


So the answer is x=7 which means that 7 locks can be replaced for $236.