Laura wants to make a cake. Each cake calls for 2 cups of milk for every 3 eggs used. If Laura wants to make 13 cakes, how much milk and how many eggs will she need?

tip $2.90

total $17.40

this is a direct variation proportion. y = kx

y is the total amount due, k is the constant of variation, and x is the number of texts sent.

plug in the 3.20 and the 16 to solve for the "k". this is the constant of proportionality. it is the value that will not change.

3.20 = k(16). solving you get $.20 per text.

the equation would then be y = .20x