Selena babysit on the weekends. The equation is Y equals 13x represents the amount of money she earns. What is the constant of proportionality

Since the equation of proportionality is represented as y = kx, k being the proportionality constant. And here the amount that selena earns on the weekends by doing babysitting is represented as y = 13x. So deriving from the equation above k is 13, which is the proportionality constant.