section p.1 – graphs and models
DESCRIPTION
Section P.1 – Graphs and Models. How to Graph. Make a table to graph y = x 2 + 2. Only use a ruler if the relation is linear. -5. 27. -4. 18. Use your knowledge of relations and functions to make sure you pick values of x that make a complete graph. -3. 11. -2. 6. -1. 3. 0. - PowerPoint PPT PresentationTRANSCRIPT
Section P.1 – Graphs and Models
How to Graphx yMake a table to graph y = x2 + 2
-5
-4
-3
-2
-1
0
1
2
3
4
5
Use your knowledge of relations and functions to make sure you pick
values of x that make a
complete graph.
27
18
11
6
3
2
3
6
11
18
27You do not need to plot every point, but make sure
to get the complete graph.
Only use a ruler if the relation is linear.
Definitions
x-intercept Where the graph crosses the x-axis OR The value of x when y is 0.
y-intercept Where the graph crosses the y-axis OR The value of y when x is 0.
Types of SymmetryWith Respect to the…
y-axis x-axis origin
Tests…
Replacing x in the equation by –x yields
an equivalent equation.
Replacing y in the equation by –y yields
an equivalent equation.
Replacing x in the equation by –x and y
by –y yields an equivalent equation.
Example of SymmetryTest for symmetry in the equation .4y x
4y x
4y x
Check out the graph first. Test by Replacing x in the equation by –x.
The equation is symmetric with respect to the y-axis.
An equivalent equation.
System of Equations Example
Solve the following system of equation algebraically:
2 22
3 28
y x
y x
22 3 822 xx 22 5 28x
50 5x10 x
3 10 28y 30 28y 2y
10,2
y
2 22x Both equations equal y. Set them
equal to each other.
System of Equations Example
2 2 18
3
x y
x y
Solve the following system of equation algebraically:
2 2 83 1y y 6 2 2 18y y
6 18
No Solution.
3 yx
FALSE
The two lines are parallel. They
never intersect.
System of Equations Example
Solve the following system of equation algebraically:
2 22
3 28
y x
y x
22 3 822 xx 22 5 28x
50 5x10 x
3 10 28y 30 28y 2y
10,2
y
2 22x