Answer:
54 movies
Step-by-step explanation:
shelving unit has 4x + 6 movies
and each holds 12 movies,
then x =12
Then solve 4x + 6 for x= 12
4(12) + 6 = 54
My guy I have no idea so I would just cheat sorry
Explaination
Answer:
I've never had to deal with this before but I would say C
3a + 6b = 45
2a - 2b = -12....multiply by 3
----------------
3a + 6b = 45
6a - 6b = - 36 ...(result of multiplying by 3)
---------------add
9a = 9
a = 1
3a + 6b = 45
3(1) + 6b = 45
3 + 6b = 45
6b = 45 - 3
6b = 42
b = 7
solution is : (1,7)
