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6-63.

p = pizza slices (#)
b = burritos (#)

One equation should be about the amount of money collected from the burritos and pizza slices sold.
The other equation should be about the number of pizza slices sold compared to the number of burritos sold.

2.50p + 3b = 358
p = 2b − 20

Use the substitution method with the equations you found in part (a).