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Step-by-step explanation:
if I understand correctly, then the 3 friends ordered a combo meal each.
so, 3 drinks and 3×2 = 6 slices of pizza are ordered.
and that costs in total $31.50.
each drink costs $2.50.
so, the calculation is (with x being the price of a pizza slice) :
3×2.5 + 6x = 31.5
7.5 + 6x = 31.5
6x = 24
x = 4
so, each slice of pizza costs $4.