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# 4.2,4.3 graphing

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Algebra 1
4.2 and 4.3 slideshow

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### 4.2,4.3 graphing

1. 1. Graphing Linear Equations 4.2 p. 210
2. 2. A solution to an equation is an ordered pair (x, y) that makes the equation true.
3. 3. A solution to an equation is an ordered pair (x, y) that makes the equation true. The graph of an equation is the set of all the solutions.
4. 4. A solution to an equation is an ordered pair (x, y) that makes the equation true. The graph of an equation is the set of all the solutions. The graph of a linear equation is a line.
5. 5. Graphing an Equation 1. Rewrite the equation by solving for y.
6. 6. Graphing an Equation 1. Rewrite the equation by solving for y. 2. Choose a few values for x and make an input/output table.
7. 7. Graphing an Equation 1. Rewrite the equation by solving for y. 2. Choose a few values for x and make an input/output table. 3. Plot each ordered pair.
8. 8. Graphing an Equation 1. Rewrite the equation by solving for y. 2. Choose a few values for x and make an input/output table. 3. Plot each ordered pair. 4. Connect the points with a straight line.
9. 9. Horizontal and Vertical lines  The graph of y = b is a horizontal line.  “b” means any number. y = 2
10. 10. Horizontal and Vertical lines  The graph of x = a is a vertical line.  “a” means any number. x = - 3
11. 11. Horizontal and Vertical lines  What is the “x” value for any point on the line x = -3? x = - 3
12. 12. Intercepts 4.3
13. 13. Intercepts  The x-intercept is the point where a graph crosses the x-axis.
14. 14. Intercepts  The x-intercept is the point where a graph crosses the x-axis.  The y-intercept is the point where a graph crosses the y-axis.
15. 15. Finding Intercepts To find the x-intercept of a graph, plug in y=0 and solve for x.
16. 16. Finding Intercepts To find the x-intercept of a graph, plug in y=0 and solve for x. To find the y-intercept of a graph, plug in x=0 and solve for y.