Question

Mary is spending money at the average rate of $5 per day. After 14 days she has $68 left. The amount left depends on the number of days that have passed. write an equation for the situation

A. Y-68=-5(x-14) B. Y+68=5(x+14) C. Y+68=-5(x-14) D. Y+68=5(x-14)

Answer 1

Explanation:

Michael C is correct, but you were asking about the "point slope" form

y - y1 = m(x-x1)

As Michael stated, the slope intercept form will be y = -3x + b

since the amount decreases by $3 per day...

Our slope is -3 so m=-3

We have a point (x1,y1) = (14, 68)

y-68 = -3(x-14)

y-68 = -3x + 42

y = -3x + 110