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Ghella [55]
2 years ago
15

How to write an equation in standard form for a circle of other radius 3 centered at the origin

Mathematics
2 answers:
natali 33 [55]2 years ago
5 0

Answer:

from \: general \: equation \\  {x}^{2}  +  {y}^{2}  + 2gx + 2fy + c = 0 \\ at \: the \: origin \:  \: g = 0 \: and \: f = 0 \\since \: c =  {g}^{2}  +  {f}^{2} +  {r}^{2}  \\ whe re \: r \: is \: radius \\  therefore \: c =  {3}^{2}  = 9 \\  =  >  {x}^{2}  +  {y}^{2}  + 9 = 0

Y_Kistochka [10]2 years ago
3 0

Answer:

What is the diameter of a circle if the radius is 3

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I think the answer is b???
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Answer:

287.94 (c)

Step-by-step explanation:

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Even though the aswer isn't exact whe rounded off the answer is $287.94.

SO THE FINAL ANSWER IS $287.94.

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tatiyna

Step-by-step explanation:

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14.What is the solution of the system?
Archy [21]

Answer:

14.  x=-2.5,  y = -7

15.  x=28  y = -20

Step-by-step explanation:

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-1*(4x-y)= -1*(- 3)

-4x +y = 3

Then add this to the second equation.

-4x+y = 3

6x-y= - 8

--------------

2x   = -5


Divide each side by 2

x = -2.5

We still need to find y

-4x+y =3

-4(-2.5) + y =3

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Subtract 10 from each side.

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15.I will again use elimination to solve this system, because using substitution will give me fractions which are harder to work with.   I will elimiate the y variable.  Multiply the first equation by 11

11( 5x+6y)= 11*20

55x+66y = 220

Multiply the second equation by -6

-6(9x+11y)=32*(-6)

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Add the modified equations together.

55x+66y = 220

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---------------------------

x = 28

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Subtract 140 from each side

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Divide by 6

y = -20

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2 years ago
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