The boys and girls basketball teams are selling raffle tickets to raise money to go on a trip to Disney World. The boys basketball team have already raised $450 and are selling raffle tickets for $5 each. The girls basketball team have raised $750 and are selling raffle tickets for $3 each. Create a system of equations you can use to determine how many tickets both teams should sell to have an equal amount of money raised to go on a trip to Disney.