Answer:
Step-by-step explanation:
Let the number of coupon books be c and recipe books be r.
<u>Then we have following equations:</u>
- c + r = 42
- 12c + 7.5r = 441
<u>Substitute r in the second equation and solve for c:</u>
- r = 42 - c
- 12c + 7.5(42 - c) = 441
- 12c - 7.5c + 315 = 441
- 4.5c = 441 - 315
- 4.5c = 126
- c = 126/4.5
- c = 28
Answer:
Hey there!
Substitute would be your answer.
Let me know if this helps :)