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jiiaxuan2035
29.01.2020 •
Mathematics
Using the following equation, find the center and radius of the circle. you must show all work and calculations to receive credit.
x2 + 4x + y2 − 6y = −4
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Ответ:
A. (see Step-by-step explanation)
B. (-1, 4)
Step-by-step explanation:
Since both functions are equal to y, we can set them equal to each other.
-x + 3 = 4x + 8
Add the x to both sides (because it is negative on the left) and subtract the 8 from both sides (because it is positive on the right and we need to isolate the variable).
-5 = 5x
Divide both sides by 5 (because it is being multiplied to the x) to isolate x.
x = -1
Next, to solve for y, we can plug in -1 for x in either equation from the beginning.
y = -(-1) + 3
y = 1 + 3
y = 4