The expression 2x + 50 represents the elevation above sea level, in meters, of a rock climber after x minutes of climbing. What is the rock climber's initial height above sea level?

We let y equal to the elevation above sea level so that the elevation of the rock climber after x minutes of climbing would be:

y = 2x + 50

His initial height can be calculated when x is equal to zero it is when the climber is not yet climbing. Therefore, the rock climber'sinitial height above sea level would be 50 meters.