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Steve bought a total of 8 tapes and CD's. Each tape cost $12 and each CD cost $18. How many tapes and how many CD's did he buy if he spent a total of $126?

 Jan 23, 2020
 #2
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t=tapes

c=CD's

 

t+c=8

12t+18c=126

 

multiply {c+t=8} by -12 and set up your system of equations

 

-12t-12c=-96

12t+18c=126

6c=30

c=5

t=3

 

check:

5+3=8 yes :)

12(3)+18(5)=126 also yes :)

 

therefore c=5, t=3

 Jan 23, 2020

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