1) Doctors have two methods of calculating maximum heart rate. With the first method, maximum heart rate, y, in beats per minute
is y=220 - X, where x is the person's age. Maximum heart rate
with the second method is shown in the table. (Example 1)
Age, x
Heart rate (bpm), y
20
194
30
187
40
180
50
173
60
166
Hint: y = 220 - x is like writing y = -x + 220
a) which method gives a greater maximum heart rate for a 70 year old?
b) Are heart rate and age proportional or non proportional for each method?
2)