Question

Mark starts a rock climb when he is 1 mile above sea level. He can climb at the rate of 1.5 miles per hour. Which of the following functions would express Mark's height above sea level over time? f(x) = 1.5x f(x) = 1 + 1.5x f(x) = 2.5x

Answer 1

Write a linear function in the form y = mx + b. Here, b = initial value = y intercept = 1 mile. m = slope = 1.5 mph. Let x represent time in hours.

Then y = (1.5 mph)x + 1 mile (ans)

Answer 2

f(x) = 1 + 1.5x

I hope this helps ya :)