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On Monday you go to the drive thru and order 2 subs and 3 drinks and spend $24.25 and on Wednesday you go to the same drive-thru and order 3 subs and 4 drinks and spend $33.00. How much does one drink cost?

Equations

2 S + 3 D = 24.25

3 S + 3 D = 33
find D
solve using substitution method