# math

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two records and three tapes cost \$31.three records and two tapes cost \$29 .find the cost of each record and each tape

• math -

2r + 3t = 31
3r + 2t = 29

1st times 2 ---> 4r + 6t = 62
2nd times 3 --> 9r + 6t = 87

subtract them
5r = 25
r = 5
back into the first ---> 10 + 3t = 31
3t = 21
t = 7

record costs \$5 ,and a tape costs \$7

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