The population of mexico has been increasing at anaual rate of 1.7%. if the population was 100,350,000 in the year 2000, predict its population in 2015. round to the neaest whole number.

you first to choose the points and then move from then as the slope you have

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