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let the cost of a pen be p dollars. Write an expression for the total cost of four pens and seven mechanical pencils in term of p

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Jennifer H. | Pre-K Through College TutorPre-K Through College Tutor
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Let P=cost of the pen ($)
Let M=cost of mechanical pencils ($)
 
4P+7M
 
Let's say the problem said, "The total cost of 4 pens and 7 mechanical pencils was $300. Write an expression for the total cost using P for the cost of the pen." Then the formula would be:
 
4P+7M=300