First you subtract 28 - 10 which equals 18. This is because you already know Aliyah didn’t spend those $10 on pencils. So it says she bought 6 pencils with $18. To find out how much each pencil cost you divide. 18 divided by 6 equals 3. So each pencil costs $3. I hope this helps!
I would say 2. As the line of best fit is supposed to represent the average of all the data points. It's not nessecarily needed to go through every point.
