Steve has three times as many quarters as half-dollars. the coins total $13.75. how many total coins does he have, how would you solve this type of problem? ?

For this case, the first thing we must do is define variables.
 We have:
 x: number of quarters
 y: number of half dollars
 We write the system of equations that adapts to the problem.
 We have then:
 
 Solving the system of equations graphically, we have:
 
 (see attached image for graphic solution)
 The amount of coins you have is:
 
 
 He has 44 coins in total

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