Question 1097014
Difference in price/difference in weight is the slope
y is a function of x
cost is a function of weight
Therefore, the slope is (2.99-2.59)/(18-14)
=0.40/4=$0.10/1 ounce.
This holds for 18-26 ounces, too
The price increase 10 cents an ounce
Therefore, 21 ounces is $2.99+$0.30=$3.29
It would increase $0.50 for 5 more ounces, and that price checks the $3.79 given.