Let be "e" the number of tickets that the radio station gave away to employees and "l" the number of tickets that the radio station gave away to listeners.
Based on the data given in the exercise, you can set up the following System of equations:
Finally you must apply the Substitution Method to solve the System of equations.
To apply it, you must substitute the second equation into the first one and then you must for the variable "e".
Through this precedure you get the following value of "e":
To find what one yard would cost you would take the price and divide it by the number of yards. In this case, 1 yard happens to cost $4.59. You then multiply 4.59 times 3 to get 13.77