Reflections, Translations and Dilations

Which rule would represent a dilation?

• (x, y) --> (x - 3, y + 4)

• (x, y) --> (3x, 4y)

• (x, y) --> (x, -y)

• (x, y) --> (3x, 3y)

• (x, y) --> (-x, y)

Which rule would represent a translation?

• (x, y) --> (x + 290, y + 43)

• (x, y) --> (x - 9, 2y)

• d(x, y) --> (12x, 12y)

• all of these are translation rules

Which rule shows a reflection over the x-axis?

• (x, y) --> (-x, y)

• (x, y) --> (-x, -y)

• (x, y) --> (x, -y)

• Not here

Which rule shows a reflection over the y-axis?

• (x, y) --> (-x, y)

• (x, y) --> (-x, -y)

• (x, y) --> (x, -y)

• Not here

Point T(9, -7) is translated by the rule (x, y) --> (x - 12, y - 11). What are the coordinates of T'?

• (-3, -18)

• (-3, 4)

• (-3, 18)

• (3, 4)

• (3, 18)

Point K(3, -6) is reflected over the y-axis. What is the coordinates of K'?

• (-3, -6)

• (-3, 6)

• (3, 6)

• (3, -6)

• not here

If a figure is dilated by a scale factor of 1/3, what happens to perimeter?

• 1/3 of the size

• 1/9 the size

• 2/3 the size

• not here

• 2/9

If figure is dilated by a scale factor of 2/5, what happens to the area?

• 2/5

• 4/25

• 4/5

• not here

• 1/5

Point B(-7, -12) is reflected over the x-axis. What are the coordinates of B'?

• (7, 12)

• (-7, 12)

• (7, -12)

• (-7, -12)

A figure is dilated so that point C(2, 9) becomes C'(8, 36). what is the rule for this transformation?

• (x, y) --> (1/4x, 1/4y)

• (x, y) --> (4x. 4y)

• (x, y) --> (x + 6, y + 27)

• Not here

• (x, y) --> (x - 6, y - 27)