Answer:
One pen costs $2
Step-by-step explanation:
The 7 mechanical pencils costed $5.25, so $13.25 minus $5.25 is $8; and $8 divided by $4 is $2. So each pen costs 2 dollars.
Equation: 4n = 13.25 - 5.25
The variable n stands for the cost of one pen.
I hope this helps! I'm pretty confident in this answer, myself so I think you'll do great!
