A checking account is set up with an initial balance of $4800, and $400 is removed from the account each month for rent (no other transactions occur on the account). a) What are the independent and dependent variables?

b) What is the slope and what does it mean in context?

c) What is the y-intercept and what does it mean in context?

b) What is the x-intercept and what does it mean in context?

d) Write a function that models the amount of money in the account after m months.

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."