If the graph of is transformed to , what is the scale factor of the dilation?
Table of contents
- 0. Review of College Algebra4h 45m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
0. Review of College Algebra
Transformations
Multiple Choice
Which of the following is the correct mapping rule for a rotation about the origin in the coordinate plane?
A
B
C
D
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Verified step by step guidance1
Recall that a rotation of 180 degrees about the origin in the coordinate plane means turning every point around the origin by half a full circle.
Understand that rotating a point \((x, y)\) by 180 degrees will place it directly opposite on the coordinate plane, which geometrically corresponds to negating both the \(x\) and \(y\) coordinates.
Express this transformation as a mapping rule: the point \((x, y)\) is mapped to \((-x, -y)\) after a 180 degree rotation about the origin.
Compare this mapping rule to the given options to identify which one matches the transformation \((x, y) \to (-x, -y)\).
Confirm that the correct mapping rule for a 180 degree rotation about the origin is \((x, y) \to (-x, -y)\), as it correctly represents the rotation.
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