# the line graph describes the target heart rate, in beats per minute, of a person age in years, who is exercisi?

the line graph describes the target heart rate, in beats per minute, of a person age in years, who is exercising. The goal is to get the number of heart beats per minute, to this target level. (20,159) and (50,135).

The equation of the line is __.

The rate of change in the target heart rate is ___ beats/minute per year of age.

The target heart rate of a person age 40 is __ beats/minute.

Relevance
• 8 years ago

Slope = m = ( 135 - 159 ) / ( 50 - 20 ) = - 24/ 30 = - 4/5

Equation of the line :

m = -4/5....... P ( 50, 135 )

y - 135 = - 4/5 ( x - 50 )

........ y = - 4/5 x + 40 + 135

........ y = - 4/5 x + 175 ...... The equation of the line

Where x = age and y = beats / min

Rate is - 4/5 beats/ min per year

Age 40 that is x = 40

y = - 4/5 (40) + 175 = - 32 + 175 = 143 beats/ min

• gaul
Lv 4
4 years ago

Target Heart Rate Graph

• Anonymous
5 years ago

It is uncommon and also very dangerous! A normal resting heartrate is between 80-100 beats per minute. Even during strenuous exercise, one should have a heart rate no higher than 170 beats per minute. She could be causing permanent heart damage and should see a cardiologist for a cardiac stress test and/or echocardiogram

• fcas80
Lv 7
8 years ago

rate of change =(159-135)/(20-50) = -0.8

equation is: heartbeat - 159 = -0.8*(age - 20)

-0.8*(40 - 20) + 159 = 143