What 3 coins add up to 40cents?
2 answers:
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Equations are set up by who bought what, and the P stands for popcorn and the D for drinks
1) multiply first equation by -7 so that the Ds are able to cancel out
2) place the second equation right under the first and add the 9p to -49p and so on
3)divide by -40 on both sides and the answer for p is $2.50
4) plug p into the equation
5)multiply 7 and 2.5 and subtract 17.5 on both sides
6) divide on both sides by 2
The amount for drinks is $8
1) multiply first equation by -7 so that the Ds are able to cancel out
2) place the second equation right under the first and add the 9p to -49p and so on
3)divide by -40 on both sides and the answer for p is $2.50
4) plug p into the equation
5)multiply 7 and 2.5 and subtract 17.5 on both sides
6) divide on both sides by 2
The amount for drinks is $8