From the information given, the inequality that models the situation is:
[tex]4x + 3y \leq 60[/tex]
The cold water flows at a rate of 4 gallons per minute, hence, the amount after x minutes will be of: [tex]4x[/tex]
The hot water fills at a rate of 3 gallons per minute, hence, the amount after y minutes will be of: [tex]3y[/tex].
The total amount is the sum of these amounts, hence:
[tex]T = 4x + 3y[/tex]
It holds a maximum of 60 gallons, hence:
[tex]T \leq 60[/tex]
[tex]4x + 3y \leq 60[/tex]
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