Mia can purchase a 40 ounce jar of peanut butter for 5.20 or a 15 ounce jar for 2.70 how much does mia save per ounce by buying the 40 ounce jar

Mia could save 20 cents if she buys the 40 ounce jar of peanutbutter. If she bought Two 15 ounce jars of peanutbutter, it would cost 5 dollars and 40 cents; and it would be 10 ounces less than the 40 ounce.

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation: