I need help ASAP on Linear Equations and Inequalities

Question

Over the last three evenings, Teresa received a total of 79 phone calls at the call center. The first evening, she received 5 fewer calls than the third evening. The second evening, she received 2 times as many calls as the third evening. How many phone calls did she receive each evening?

Number of phone calls the first evening:

Number of phone calls the second evening:

Number of phone calls the third evening:

Answer 1

F+S+T = 79

F=T-5

S=2T

T-5 + 2T + T = 79

4T = 84

T = 21 calls on 3rd evening

S = 42 calls on 2nd evening

F =16 calls on 1st evening