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Pearson Geometry Common Core, 2011

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Pearson Geometry Common Core, 2011 View details

1. Translations

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Exercise 43 Page 552

Line perpendicular to a horizontal line is vertical.

x = - 1

Practice makes perfect

To write the equation of a line perpendicular to the one whose equation is given, we first need to determine its slope.

The Perpendicular Line's Slope

Notice that we are given a horizontal line. y = 1

We know that a line perpendicular to a horizontal line is vertical. x = a

Writing the Perpendicular Line's Equation

Let's substitute the given point ( - 1, - 1) into equation x = a. x = a ⇔ - 1 = a Now that we found the value of a, we can complete the equation. x = a ⇔ x = - 1

Subchapter links

Lesson Check p.549

Standardized Test Prep p.552

Mixed Review p.552