math algrebra help

Question

The model m=-0.711a + 206.3 was developed by londeree and moeschberger to determine the maximum heart rate M of an individual who is age a

a. solve the model for A

b. according to this model what is the age of an individual whose maximum rate is 160?

Answer 1

(a) m=-0.711a+206.3,

0.711a=206.3-m,

a=(206.3-m)/0.711.

(b) m=160, a=(206.3-160)/0.711=46.3/0.711=65 years approx.