You and your friends go out to eat and you have $80 altogether. The tax is 7% and you want to leave an 18% tip. Ahat is the maximum amount your group can spend and not go over $80? Please make a graph or chart to support your answer.
x is the maximum you can spend. So, x+.07x+.18x<=80. 1.25x=80. 80/1.25=64. $64 is the maximum you can spend.