Graphs of Straight Lines

Page
1

Slide 1

Graphs of Straight Lines

How to graph equations and find equations from graphs.

Slide 2

Tables of Values

A table of values is used to generate points.

These points can be plotted on the coordinate plane.

A straight line drawn through these points creates the graph of the equation.

Slide 3

Example

Graph y = 2x – 5

-3

-1

1

3

5

Slide 4

Plot these points on the coordinate plane.

Slide 5

Draw a straight line through the points

Slide 6

Exercises

Graph the following straight lines:

y = 3x – 4

y = 2x + 1

y = x – 5

y = -3x +2

Look for a relationship between the graphs and their algebraic expressions!!!

Slide 7

The Gradient-Intercept Form of a Straight Line

When a linear function is written in the form

y = mx + b

the m is its gradient and the b is its y-intercept.

Slide 8

What’s the Equation?

For the following graphs, determine their equation.

Slide 9

Slide 10

Slide 11

Slide 12

Slide 13