Answer:
The system of equations are:

CDs sold this week is 26 and that of last week is 84.
Step-by-step explanation:
Let the number of CDs sold this week be
and last week be 
Given:
CDs sold last week = 6 more than 3 times she sold this week
∴
------------- 1
Also, total number of CDs sold are 110.
∴
------------ 2
Therefore, the above two equations are systems of equations that can be used to find the number of CDs she sold last week and the number of CDs she sold this week.
Now, in order to solve, we plug in the value of
from equation (1) in equation (2). This gives,

Now, 
Therefore, the number of CDs sold this week is 26 and last week is 84.
Answer:
thank you
Step-by-step explanation:
Considering the first equation 15 × 0 = -36 + a
15 × 0 = 0
therefore, -36 + a =0
In the second equation
24 × 8 × 0 = 36 - b
Consider the LS
24 × 8 × 0 = 0
Therefore, 36 - b = 0
we are left with the two equations,
36 - b = 0
-36 + a = 0
then, we calculate the number that can be substituted to satisfy the two equations.
solving the equations
b = 36, and a = 36
Therefore, 36 is the number that can be used to substitute a and b in the equations
I believe it equals -73 1/8.