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Math III Videos 103 videos
GED Math 1.1 Graphs and Functions. Which is the appropriate region of the coordinate plane?
GED Math Graphs and Functions Drill 5, Problem 3. How many more kilowatts is Kristoph's oven rated compared to his air conditioner?
ACT Math 2.5 Coordinate Geometry 323 Views
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Description:
ACT Math: Coordinate Geometry Drill 2, Problem 5. What is the origin of the circle?
- Coordinate Geometry / Relationships between equations and graphs
- Coordinate Geometry / Graphs of points, lines, polynomials, and circles
- Product Type / ACT Math
- Foreign Language / Arabic Subtitled
- Foreign Language / Korean Subtitled
- Foreign Language / Spanish Subtitled
- Foreign Language / Chinese Subtitled
- Functions / Interpret expressions for functions in terms of the situation they model
- Geometry / Translate between the geometric description and equation for a conic section
- Properties, Measurement, and Dimension / Translate between the geometric description and the equation for a conic section
- Coordinate Geometry / Conics
Transcript
- 00:02
For a good time, solve this shmoopy question.
- 00:05
A circle has the equation (x - 3)2 + (y + 7)2 = 49. What is it's origin?
- 00:13
And here are your potential answers...
- 00:17
Okay, so this is just testing to see if we know the standard formula for a circle.
- 00:21
The formula of a circle is the quantity x minus h squared plus the quantity y minus
Full Transcript
- 00:26
k squared equals r squared, where (h, k) is the origin. Ok... so we want to find h and k...
- 00:32
And it looks like h is 3... and k is negative 7...Why?
- 00:37
Because two negatives make a positive 7 in the equation.
- 00:40
Our origin is (3, -7). Looks like our answer is C.
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