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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 8 Page 556

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

(a,b)	(- a, b)
J(5,3)	J'( -5,3)
K(1,-2)	K'( -1,-2)
L(-3,4)	L'( 3,4)

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

Subchapter links

Communicate Your Answer p.551

Monitoring Progress p.552-555

Exercises p.556-558