Writing linear equations from word problems

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You are an excellent teacher. Your graphic organizers are so helpful. You're slow and methodical. Thank you!!

ninakramer
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So detailed, well explained, wish you were my teacher, very dedicated you are...may God give you more life on this earth

hellenakongo
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I have learnt things no one would ever teach... Be blessed Valdez you're one I a trillion

hellenakongo
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Nice tutorial. Just wanted to ask if the y=mx+b formula is applicable to this problem?

You need to buy some filing cabinets. You know that Cabinet X costs $10 per unit, requires six square feet of floor space, and holds eight cubic feet of files. Cabinet Y costs $20 per unit, requires eight square feet of floor space, and holds twelve cubic feet of files. You have been given $140 for this purchase, though you don't have to spend that much. The office has room for no more than 72 square feet of cabinets. How many of which model should you buy, in order to maximize storage volume?

Mrkimoholic