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Pearson Geometry Common Core, 2011 View details

7. Equations of Lines in the Coordinate Plane

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Exercise 55 Page 195

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a The slope of a line can be found using the Slope Formula.

m=rise/run=y_2- y_1/x_2- x_1 When we consider the y-axis, we can see that the run is 0 because it is a vertical line. m=y_2- y_1/0 As we can see, in order to calculate the slope we have to divide by zero. However, this operation is undefined, so the slope itself must be undefined.

b We can think of the y-axis as a vertical line such that all of the x-values of the points on the line are 0. Therefore, the equation of the x-axis can be written as x=0.

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Lesson Check p.193

Practice and Problem-Solving Exercises p.194-196

Standardized Test Prep p.196

Mixed Review p.196

Exercise 55 Page 195

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