McGraw Hill Integrated II, 2012
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McGraw Hill Integrated II, 2012 View details
Mid-Chapter Quiz
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Exercise 5 Page 434

21

We are asked to find the measure of XY which, on the given diagram, is expressed as 6x-3. We are going to start by calculating x. Let's consider the given diagram.

From the diagram, we can see that ∠ ZWY and ∠ YWX have the same measure. Therefore, WY is the angle bisector of ∠ ZWX. Next, let's recall the Angle Bisector Theorem.

Angle Bisector Theorem

If a point is on the bisector of an angle, then it is equidistant from the sides of the angle.

According to this theorem, Y is equidistant from the sides of ∠ ZWX. In other words, distances ZY and YX are the same. Let's set the expressions for their lengths equal to one another. 4x+5=6x-3 Now we have an equation where the only unknown variable is x. Let's solve it to find the value of x.
4x+5=6x-3
Solve for x
5=2x-3
8=2x
4=x
x=4
Now that we know the value of x, we can substitute it into the expression for XY.
XY=6x-3
XY=6( 4)-3
XY=24-3
XY=21
The length of XY is 21.