Which system of equations can be used to find l, the number of CDs she sold last week, and t, the number of CDs she sold this week?

Question

Ms. Kitts works at a music store. Last week she sold 6 more than 3 times the number of CDs that she sold this week. Ms. Kitts sold a total of 110 CDs over the 2 weeks. Which system of equations can be used to find l, the number of CDs she sold last week, and t, the number of CDs she sold this week?

Answer 1

l = 6+3t

l+t = 110

6+3t + t = 110

4t = 104

t = 26 this week

l =110-26 = 84 last week

84 = 6+3(26) = 6+ 78= 84 last week

Answer 2

l = 6+3t

l+t = 110

6+3t + t = 110

4t = 104

t = 26 this week

l =110-26 = 84 last week

84 = 6+3(26) = 6+ 78= 84 last week