anonymous
  • anonymous
Write the standard equation of the circle with center (-8, -7) and a radius of 6.
Mathematics
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
A) (x + 8)2 + (y + 7)2 = 6 B) (x – 8)2 + (y – 7)2 = 6 C) (x + 8)2 + (y + 7)2 = 36 D) (x – 8)2 + (y – 7)2 = 36
anonymous
  • anonymous
@mathmath333
mathmath333
  • mathmath333
if centre is \((a,b)\) and radius is \(r\) the equation of the circle is \((x-a)^2+(y-b)^2=r^2\)

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anonymous
  • anonymous
but there is no equation that adds up to that!!!
triciaal
  • triciaal
yes there is
anonymous
  • anonymous
No it is either both subtraction or both addition
triciaal
  • triciaal
when you subtract a negative it becomes a positive
triciaal
  • triciaal
now try again
anonymous
  • anonymous
So it would be B?
triciaal
  • triciaal
no
anonymous
  • anonymous
It would be A? Because the equation has to add up to 6
triciaal
  • triciaal
|dw:1433962354349:dw|
triciaal
  • triciaal
read the response by @mathmath333
anonymous
  • anonymous
So it would be A?
triciaal
  • triciaal
look at the drawing
triciaal
  • triciaal
the equation does not have to add up to 6
anonymous
  • anonymous
Yeah so it would be A
anonymous
  • anonymous
So it would be D then?
triciaal
  • triciaal
If you insist on it being A then we cannot help you.
anonymous
  • anonymous
I said it would be D @triciaal
triciaal
  • triciaal
I said look at the formula and look at the drawing and I explained why when you get the answer you have to match the correct option
triciaal
  • triciaal
so it's not A, it's not B and it's not D please review so you understand why
anonymous
  • anonymous
Because the negative's turn into positive's and they are squared so they would add up to 36 squared
triciaal
  • triciaal
|dw:1433963008379:dw|
anonymous
  • anonymous
Yeah so it is C

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