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## Algebra 2

### Course: Algebra 2>Unit 10

Lesson 6: Solving equations by graphing

# Solving equations graphically: word problems

## Problem

A piecewise function f can model the height (in meters) of an airplane during a flight. Here is the graph of f, where t is the number of minutes that have passed since takeoff.
A graph labeled f on an x y coordinate plane. The x-axis scales by twenty and y-axis scales by one thousand. The graph increases from point (zero, five hundred) to (ten, eleven thousand). It remains constant to the point (fifty, eleven thousand). It decreases to (sixty, ten thousand). It remains constant to (one hundred, ten thousand). It then decreases to (one hundred twenty, zero).
The airplane reaches a height of 5000 meters after approximately 4, point, 5 minutes.
What is the other time the airplane reaches a height of 5000 meters?