Transformations: reflect, translate, rotate, dilate review

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Which of the following transformations does NOT preserve congruence?

• Translating a figure 3 units to the left

• rotating a figure 180 degrees clockwise

• reflecting a figure over the y axis

• dilating a figure by a scale factor of 2

what is the rule of the following dilation? hint: if the scale factor/k is less than 1, it will be a reduction.

• (x, y) → (3x, 3y)

• (x, y) → (3x, 2y)

• (x, y) → (1/3x, 1/3y)

• (x, y) → (1/2x, 1/2y)