Step by step
The question
Question: find f(0) on this graph of f.
f(0) = ?
1 Look at the graph
The graph shows f.
x goes across.
The height of the graph is f(x): we read it on the y axis.
x: across
f(x): the height, up
2 Read f(0)
The number in the brackets is the x.
Here x is 0.
f(0): x = 0 → f(x) = ?
Careful!
f of 0 does not mean a height of 0.
The 0 in the brackets is an x.
So we start at 0 on the x axis.
Careful: f(0): start at x = 0, not at a height of 0
So f(0) = 1.
f(0) = 1
3 Check
Let's check.
The answer gives a point.
(0, 1) means stay at 0, then up 1.
It lands on the graph.
So the answer is right!
(0, 1): stay at 0, up 1 → on the graph
Let's look back.
First: look at the graph.
Then: read f(0).
Last: check.
Answer
f(0) = 1