Luke decides to buy square tiles to cover his kitchen floor. Each square measures 12” by 12” and costs $2.10. How much will it cost to tile an 11’ x 12’ floor?

it would be 6xy and -16xy.

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