Colton and his children went into a grocery store where they sell apples for $1.25 each and mangos for $2 each. Colton has $20 to spend and must buy at least 12 apples and mangos altogether. Also, he must buy at most 13 apples and a maximum of 3 mangos. If x represents the number of apples purchased and y represents the number of mangos purchased, write and solve a system of inequalities graphically and determine one possible solution.
The answer must be 2 inequalities formatted so that y is greater than, less than, greater than or equal to, less than or equal to.