Substitute some arbitrary values for x to find their corresponding y-values.
Table:
x
y
- 2
0
-1
3
0
4
1
3
2
0
Graph:
Practice makes perfect
One way to graph a function rule is by making a table of values and substituting some arbitrary values for x. Doing so will give the corresponding values of y, which we can use to form ( x, y) coordinate pairs.
We can see that there is no line that passes through the five points, which means that the given function is nonlinear. Hence, we will draw a curve passing through all five of these points.
A function such as y=4-x^2 is known as a quadratic function and its graph, which is shown above, is called a parabola. You will learn more about this sort of equation later.
