SOLUTION: Can someone please help me with the problem below? I posted this last night but I had left out part of the equation. I need help desperately I am no good at doing graphs. If possib

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Can someone please help me with the problem below? I posted this last night but I had left out part of the equation. I need help desperately I am no good at doing graphs. If possib      Log On


   

Question 444835: Can someone please help me with the problem below? I posted this last night but I had left out part of the equation. I need help desperately I am no good at doing graphs. If possible can you show me how you worked it? Thank you all so much for what you do.
Maximum Heart Rate When exercising, people
often try to maintain target heart rates that are a percentage
of their maximum heart rate. Maximum heart
rate R is R=220- A, where A is the person’s age
and R is the heart rate in beats per minute.
(a) Find R for a person 20 years old and 70 years old.
(b) Sketch a graph of Assume that A
is between 20 and 70 and put A on the horizontal
axis of your graph.
(c) Interpret your graph.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Maximum heart rate R is R=220- A, where A is the person’s age

and R is the heart rate in beats per minute.

R(20) = 220-20 = 200

R(70) = 220-70 = 150

 Ordered pairs 

(70,150) and 

(20,200)   m = -50/50 = -1   |Using the point-slope formula, m+=%28y%5B2%5D+-+y%5B1%5D%29%2F%28x%5B2%5D+-+x%5B1%5D%29

Using the standard slope-intercept form for an equation of a line y = mx + b 

 where m is the slope and b the y-intercept.  

  As stated: R = -A + 220

Plot (70,150) and (20,200)and connect with line.

Graph says as age increases, that Maximum heart rate number decreases