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Graphs of Straight Lines. How to graph equations and find equations from graphs. 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. Example.

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graphs of straight lines

Graphs of Straight Lines

How to graph equations and find equations from graphs.

tables of values
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.
example
Example

Graph y = 2x – 5

3

-3

-1

1

5

exercises
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!!!

the gradient intercept form of a straight line
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.

what s the equation
What’s the Equation?

For the following graphs, determine their equation.

slide14

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