Problema Solution
A quanity of y is initially -77 and decreases at a rate of 21 per day.
Find an equation y=mx+b that models the quanity y after x units of time.
Answer provided by our tutors
Since initially it is = -77
hence b = -77
change = 21 per day i.e = -21 = m = slope
Hence equation
y = -21x -77 this is the required equation in the for y = mx+b