Reflections

Front

What is the rule for translating a point 3 units up and 2 units to the right?

Back

(x, y) -> (x + 2, y + 3)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

How do you reflect a point (x, y) over the y-axis?

Back

The reflection is (-x, y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the result of reflecting the point (2, -4) over the y-axis?

Back

(-2, -4)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the result of reflecting a point (x, y) over the x-axis?

Back

The reflection is (x, -y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If triangle CDE is reflected over the x-axis, what can be said about the line segment C'C?

Back

C'C is perpendicular to the y-axis.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What does it mean for a point to be reflected across the x-axis?

Back

The y-coordinate of the point changes sign.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the reflection of the point (1, 4) across the x-axis?

Back

(1, -4)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

If a point K is reflected across the x-axis and the result is (1, 4), what was the original point K?

Back

(1, -4)

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the general formula for reflecting a point (x, y) across the line y = k?

Back

The reflection is (x, 2k - y).

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5

Front

What is the effect of reflecting a shape over the x-axis on its coordinates?

Back

The y-coordinates of all points in the shape are negated.

Tags

CCSS.8.G.A.3

CCSS.HSG.CO.A.5