One store sold red plums at for and yellow plums at for . A second store sold red plums at for and yellow plums at for . You bought red plums and yellow plums from each store, spending a total of . How many plums in all did you buy?
Source: NCTM Mathematics Teacher, September 2006
In dollars the following equation depicts how you spent at the two stores
Collect like terms and simplify
At each store you purchase plums; in all you bought plums.