Use the identity (x+y)(x−y)=x^2−y^2 to find the difference of two numbers if the sum of the numbers is 12 and the difference of the squares of the numbers is 48. Thank you!!

step-by-step explanation:

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