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Big Ideas Math: Modeling Real Life, Grade 6

BI

Big Ideas Math: Modeling Real Life, Grade 6 View details

5. The Coordinate Plane

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Exercise 22 Page 372

To reflect a point in the x-axis, use the same x-coordinate and take the opposite of the y-coordinate.

(9,-8)

Practice makes perfect

We want to reflect a point in the x-axis of a coordinate plane. To do this, we keep the same x-coordinate and take the opposite of the y-coordinate.

Point	Reflection in the x-axis
(x, y)	(x, - y)
(9, 8)	(9, -8)

As we can see, the reflection of the point is at (9,- 8). Let’s plot our point and its reflection on the coordinate plane.

reflect point

We can see that the point is located at (9,-8) after the reflection in the x- axis of a coordinate plane.

Extra

More About Coordinate Planes

A coordinate plane is formed by the intersection of a horizontal number line and a vertical number line. The number lines intersect at the origin and separate the coordinate plane into four regions called quadrants. An ordered pair is used to locate a point in a coordinate plane. The first coordinate represents the x-axis and the second coordinate the y-axis.

Subchapter links

Try It p.370-372

Self-Assessment for Concepts & Skills p.372

Self-Assessment for Problem Solving p.373

Review & Refresh p.374

Concepts, Skills, & Problem Solving p.374-376