The band in a local school was selling bumper stickers to raise money. the net amount a in dollars raised by selling b bumper stickers is given by the function a(b) = 5b − 10. if the band sold 150 bumper stickkers, what is the net amount of money they raised?

no this is a nonlinear negative

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