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larisa86 [58]
3 years ago
10

Write the equation in standard form of a circle with center (-3,6), tangent to the y-axis.

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
8 0

Answer:

(x+3)^2+(y-6)^2=9

Step-by-step explanation:

The equation of a circle in standard form is written as

(x-a)^2+(y-b)^2=r^2

where

(a, b) are the coordinates of the center

r is the radius of the circle

In this problem, the circle is centered at (-3,6), so we have

a = -3

b = 6

Also, we know that the circle is tangent to the y-axis, and the x-coordinate of its center is 3: this means that the horizontal distance between the point of the circle tangent to the y-axis and the centre of the circle is 3, therefore the radius of the circle is 3.

So, the equation of this circle is:

(x-(-3))^2+(y-6)^2=3^2

(x+3)^2+(y-6)^2=9

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Now let’s solve the equation above using this method.

Step 1: x^2 - 12x + (-12/2)^2 = -6 + (-12/2)^2

Step 2: x^2 - 12x + (-6)^2 = -6 + (-6)^2

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