The total sales made by a salesperson was $25,000 after 3 months on the job and $68,000 after 23 months. express the total sales as a linear function of the time in months on the job.

(3,25000) (23,68000)
slope = (68000 - 25000) / (23 - 3) = 43000/20 = 2150

y = mx + b
slope(m) = 2150
use either of ur points(3,25000)...x = 3 and y = 25000
now we sub and find b, the y int
25000 = 2150(3) + b
25000 = 6450 + b
25000 - 6450 = b
18550 = b

so ur equation is : y = 2150x + 18550 <===