Jogging is one of the few sports that has been consistently increasing over the past few years. The number of people jogging​ (in millions) from the years 2000 to 2009

Question

Jogging is one of the few sports that has been consistently increasing over the past few years. The number of people jogging​ (in millions) from the years 2000 to 2009 is given by the equation y=x+22, where x is the number of years after 2000.a. Use this equation or a graph of it to complete the ordered pair ​(​4, ​ ).

b. Write a sentence explaining the meaning of the answer to part​ (a).

c. If this trend​ continues, how many joggers will there be in 2021 ​?

a. Complete ordered Pair

(4, )

Answer 1

Looks like the no. of joggers is a linear growth function. The equation is in the form y = mx + b, so the slope is 1, the y-intercept is 22 (that's the no. of joggers in MM's in year 2000, when x = 0). If the equation is y = x + 22 and they've given you the value of x in the ordered pair (4), then just substitute 4 for x in the equation to get the y. That would be the number of joggers in year 2004.

For the number of joggers in 2021, use 2021 - 2000 = 21 for the x value and solve the equation for y.