In this context, you would be making a equation using the format: y=mx+b
M being your rate of change
X being the month
B being the starting number
Beverly is LOSING 4 pounds a month, so she would be decreasing by 4, or in other words, -4. That would be your M value
Beverly starts at 160, so that would be your B value
Your equation would look like this:
y= -4x+160
Your answer would be B. y = -4x +160
A) is not the answer because you can't be -160 pounds
C) is not the answer because the 1 is not part of the text.
D) is not the answer because 160 has to be used in the equation in order for it to make sense, you don't start at 0 pounds.