Problem 137 of 7
Use coordinate transformation (x,y)->(x,-y) to show triangle 1, 1; 3, 1; 1, 4 is congruent to 1, -1; 3, -1; 1, -4.
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map vertices with rigid-motion rules.
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Rule must be a rigid-motion coordinate transformation.
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Your answer is equivalent to the expected form.
Walkthrough
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1. Apply the coordinate rule to each preimage vertex.
2. Verify the transformed vertices match the image triangle.
3. Since the rule is a rigid motion, conclude congruence.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Using a dilation rule for congruence proof.