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# Graphs of straight lines

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How to graph equations and find equations from graphs.

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### Graphs of straight lines

1. 1. Graphs of Straight LinesHow to graph equations and findequations from graphs.
2. 2. Tables of Values• A table of values is used to generatepoints.• These points can be plotted on thecoordinate plane.• A straight line drawn through these pointscreates the graph of the equation.
3. 3. ExampleGraph y = 2x – 5x 1 2 3 4 5y -3 -1 1 3 5
4. 4. Plot these points on the coordinate plane.x 1 2 3 4 5y -3 -1 1 3 5
5. 5. Draw a straight line through the points
6. 6. ExercisesGraph the following straight lines:1. y = 3x – 42. y = 2x + 13. y = x – 54. y = -3x +25.32+=xyLook for arelationshipbetween thegraphs and theiralgebraicexpressions!!!
7. 7. The Gradient-Intercept Form of aStraight LineWhen a linear function is written in the formy = mx + bthe m is its gradient and the b is its y-intercept.
8. 8. What’s the Equation?For the following graphs, determine theirequation.
9. 9. This powerpoint was kindly donated towww.worldofteaching.comhttp://www.worldofteaching.comIs home to well over a thousand powerpointssubmitted by teachers. This a free site. Please visitand I hope it will help in your teaching