7. David is having his birthday party at a water park. The park charges $150 plus $10 per guest. The total cost of the party y c
2 answers:
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First recognize that the unit rate we're finding is gallons per hour, or 
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rate for Tank 1 = x gallons per hour = <em>a</em> gallons / <em>b</em> hours
rate for Tank 2 = y gallons per hour = <em>c</em> gallons / <em>d</em> hours
rate for Tank 1 = x gallons per hour = <em>a</em> gallons / <em>b</em> hours
rate for Tank 2 = y gallons per hour = <em>c</em> gallons / <em>d</em> hours