Question

You are an avid coin collector. You decide to start keeping better track of your coin collection:after 15 days you count and find out you have 155 coins. After 22 days,you have 218 coins. Write an equation in point-slope form

Answer 1

9514 1404 393

Answer:

y - 155 = 9(x -15)

Explanation:

The given points are ...

(days, coins) = (15, 155) and (22, 218)

The slope is given by the slope formula:

m = (y2 -y1)/(x2 -x1) = (218 -155)/(22 -15) = 63/7 = 9

The point-slope form is for a line with slope m through point (h, k) is ...

y -k = m(x -h)

Here, we have m=9 and (h, k) = (15, 155), so the equation can be written ...

y - 155 = 9(x -15)