Mr. Duran wrote the following two statements on a chalkboard. When y equals 85, x equals -20. If both statements are true, what is the value of y when the value of x is 9?

i believe the answer is 323 ft

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