SOLUTION: i need help please, my question is what would be the equation for " the circle is tangent to the y-axis and has its center at (-8,-7)
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Question 600209: i need help please, my question is what would be the equation for " the circle is tangent to the y-axis and has its center at (-8,-7)
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
A tangent to a circle is perpendicular to a radius at the point of tangency, hence the center is one radius away from the axis, i.e. the radius of this circle must be 8. Use the standard form of the equation of a circle:
^2\ +\ (y\ -\ k)^2\ =\ r^2)
And the information you know to write your desired equation. Remember, substituting a negative number for either 
or 
results in "minus" a "minus".
John
My calculator said it, I believe it, that settles it
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