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# Give a geometric description of the set of points in space whose coordinates satisfy the given pairs of equations. x^2 + ( y - 1)^2 + z^2 = 4, y = 0 # Give a geometric description of the set of points in space whose coordinates satisfy the given pairs of equations. x^2 + ( y - 1)^2 + z^2 = 4, y = 0

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Equations asked 2020-12-17
Give a geometric description of the set of points in space whose coordinates satisfy the given pairs of equations. $$\displaystyle{x}^{{2}}+{\left({y}-{1}\right)}^{{2}}+{z}^{{2}}={4},{y}={0}$$

## Answers (1) 2020-12-18
Step 1
The given equations are $$\displaystyle{x}^{{2}}+{\left({y}−{1}\right)}^{{2}}+{z}^{{2}}={4}$$ and y=0.
Substitute y=0 in $$\displaystyle{x}^{{2}}+{\left({y}−{1}\right)}^{{2}}+{z}^{{2}}={4}$$ and simplify as follows.
$$\displaystyle{x}^{{2}}+{\left({0}−{1}\right)}^{{2}}+{z}^{{2}}={4}$$
$$\displaystyle{x}^{{2}}+{1}+{z}^{{2}}={4}$$
$$\displaystyle{x}^{{2}}+{z}^{{2}}={4}−{1}$$
$$\displaystyle{x}^{{2}}+{z}^{{2}}={\left(\sqrt{{{3}}}\right)}^{{2}}$$
Step 2
Geometrical description:
The set of points in space whose coordinates satisfy the given pairs of equations. $$\displaystyle{x}^{{2}}+{\left({y}-{1}\right)}^{{2}}+{z}^{{2}}={4},{y}={0}$$ is the circle with center origin in xz-plane and its radius is $$\displaystyle\sqrt{{{3}}}$$.

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To determine:
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