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Big Ideas Math Integrated I, 2016

BI

Big Ideas Math Integrated I, 2016 View details

2. Reflections

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Exercise 5 Page 553

Two points reflected in the x-axis have opposite y-coordinates.

Practice makes perfect

We are given three vertices of △ JKL. To graph the triangle, let's plot the points and then connect them.

To find the images of the points reflected in the x-axis, we can use the coordinate rule. Two points reflected in the x-axis have opposite y-coordinates.

(a,b)	(a,- b)
J(1,3)	J'(1, -3)
K(4,4)	K'(4, -4)
L(3,1)	L'(3, -1)

Now we can graph the image of △ JKL after a reflection in the x-axis.

Subchapter links

Communicate Your Answer p.551

Monitoring Progress p.552-555

Exercises p.556-558