Graphs of Straight Lines

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Presentation transcript:

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 Graph y = 2x – 5 x 1 2 3 4 5 y -3 -1 1 3 5

Plot these points on the coordinate plane. x 1 2 3 4 5 y -3 -1

Draw a straight line through the points

Exercises Graph the following straight lines: y = 3x – 4 y = 2x + 1 Look for a relationship between the graphs and their algebraic expressions!!!

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? For the following graphs, determine their equation.

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