- A
- B
- C
- D(- 4, 0)
View written solutionFree
Correct answer: D
Step-by-step Solution:
-
Understand the geometric properties of the circle. The problem states that the circle touches the y-axis at the point
(0, 2).- For any circle that is tangent to the y-axis at a point
(0, k), its center must have the y-coordinatek. So, the center of our circle is of the formC(h, 2). - The radius
rof the circle is the perpendicular distance from the center(h, 2)to the y-axis (the linex=0). This distance is|h|. So,r = |h|.
- For any circle that is tangent to the y-axis at a point
-
Formulate the equation of the circle. The standard equation of a circle with center
(h, k)and radiusris: Substitutingk = 2andr = |h|(which means ), we get the equation for our specific circle: -
Use the given point to find the value of
h. The circle passes through the point(-1, 0). We can substitutex = -1andy = 0into the circle's equation to solve forh. Expanding the terms: Subtracting from both sides: -
Write the final equation of the circle. Now we have the parameters of the circle:
- Center:
C(h, k) = (-5/2, 2) - Radius:
r = |h| = |-5/2| = 5/2The equation of the circle is:
- Center:
-
Check which of the given points lies on the circle. We will substitute the coordinates of each option into the equation of the circle .
-
A: : This option involves division by zero, which is undefined. The point is not valid.
-
B: : Let's substitute
x = -5/2andy = 2. Since , this point is not on the circle. In fact, this is the center of the circle. -
C: : Similar to option A, this option is invalid due to division by zero.
-
D:
(- 4, 0): Let's substitutex = -4andy = 0. The result matches the right side of the equation (). Therefore, the point(-4, 0)lies on the circle.
-
Conclusion
The circle passes through the point (-4, 0). So, option D is the correct answer.
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