Evaluating Functions: Graphs

Evaluating Functions: Graphs

We have seen how to evaluate functions from:

• ​​Equations

• ​Tables

• ​Ordered Pairs

• ​Mapping Diagrams

​​Today, we are going to be looking at how to evaluate functions from graphs!

​If we were evaluating a function and got

​what would this be as an ordered pair?

​The number in the parenthesis, 3, is the x value and f(3) is the y value!

Multiple Choice

With this in mind, try to find  $$f\left(4\right)$$  from this graph, 

• 4

• -5

• -6

• 1

​When we are evaluating functions from graphs, we want to pay attention to what the y-value is for the given x value, which we find in parentheses

​Now, let's find !

Multiple Choice

Use the graph to find  $$f\left(1\right)$$  

• 6

• 5

• -7

• 0

Multiple Choice

Use the graph to find  $$f\left(0\right)$$  

• 6

• 5

• -7

• 0

What if we were asked to find x when f(x)=-5

Multiple Choice

Use the graph to find  $$x$$  when  $$f\left(x\right)=-2$$  

• 6

• 5

• -7

• 0

Multiple Choice

Use the graph to find  $$x$$  when  $$f\left(x\right)=-5$$  

• 6

• 5

• -7

• 3