## Which of the following has the lowest unit price? a. 20 lb for $16.20, b. 26 lb for 23.40, c. 24 lb for 18.72 or, d. 22 lb for 18.70

You could find the x and y-intercepts by isolating these variables on one side. We’ll start by finding y. 15x+20y=180020y=1800-15xy=(1800-15x)/20 Now, we insert this y into the original equation (substitution). 15x+20