Rhoda pays for Internet access each month. The graph shows the relationship
between the total amount she has paid and
the amount of time, in months. What is the
slope of the line? What does the slope
mean?
Total Amount Pald
for Internet ($) what is the solution?

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