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Practice proving that a quadrilateral is a parallelogram.

In quadrilateral WXYZ, [tex]WC = 2x + 5[/tex] and [tex]CY = 3x + 2[/tex]. What must [tex]x[/tex] equal for quadrilateral WXYZ to be a parallelogram?

Solve for [tex]x[/tex].

Answer :

Since the diagonals of a parallelogram bisect each other, the two segments of each diagonal must be equal in length. In quadrilateral [tex]\(WXYZ\)[/tex], we are given:

- [tex]\(WC = 2x + 5\)[/tex]
- [tex]\(CY = 3x + 2\)[/tex]

Because the diagonals bisect each other, we have

[tex]$$
2x + 5 = 3x + 2.
$$[/tex]

Now, we solve this equation step by step:

1. Subtract [tex]\(2x\)[/tex] from both sides to isolate the term with [tex]\(x\)[/tex]:

[tex]$$
5 = x + 2.
$$[/tex]

2. Next, subtract 2 from both sides to solve for [tex]\(x\)[/tex]:

[tex]$$
5 - 2 = x,
$$[/tex]

[tex]$$
3 = x.
$$[/tex]

Thus, the value of [tex]\(x\)[/tex] is

[tex]$$
x = 3.
$$[/tex]

To verify, substitute [tex]\(x = 3\)[/tex] back into the expressions for [tex]\(WC\)[/tex] and [tex]\(CY\)[/tex]:

- For [tex]\(WC\)[/tex]:

[tex]$$
WC = 2(3) + 5 = 6 + 5 = 11,
$$[/tex]

- For [tex]\(CY\)[/tex]:

[tex]$$
CY = 3(3) + 2 = 9 + 2 = 11.
$$[/tex]

Since both segments are equal ([tex]\(11 = 11\)[/tex]), this confirms that the diagonals bisect each other, and quadrilateral [tex]\(WXYZ\)[/tex] is indeed a parallelogram when [tex]\(x = 3\)[/tex].

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