The independent variables are the cost for one ticket and the number of student tickets. The cost of the tickets depends on the number of student tickets being purchased. The equation would be c = 7s.
You'll have to show work guaranteed.......so i'll tell you that you need to inverse
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He must work about 4-5 more hours, and if he works 4 hours, he would earn $240, and $300 + $240 = $540. Or, if he works for 5 hours, it would equal $300. $300 + $300 IS $600, and his savings may be $60 or $100. Your Choice.