Question

Find the values of x, y, and z in the figure, given z> 0

Answer 1

From the given graph we can observe that there are three parallel lines.

Also, angle (8x-7) and (3x-11) are same-side interior angles which means they are supplementary, the sum 180°.-

$8x-7+3x-11=180$

We solve for x.

$\begin{gathered} 11x=180+7+11 \\ 11x=198 \\ x=\frac{198}{11}=18 \end{gathered}$

Additionally, from the given graph, we deduct that angles (2y+23) and (4y+8) are alternate interior angles that are congruent.

$2y+23=4y+8$

We solve for y.

$\begin{gathered} 23-8=4y-2y \\ 2y=15 \\ y=\frac{15}{2}=7.5 \end{gathered}$

Then, angles 2y+23 and 3z2 - 5 are supplementary angles, they sum 180°.

$2y+23+3z^2-5=180$

Let's replace y and solve for z.

$\begin{gathered} 2(7.5)+23+3z^2-5=180 \\ 15+3z^2+18=180 \\ 3z^2=180-15-18 \\ z^2=\frac{147}{3}=49 \\ z=\sqrt[]{49}=7 \end{gathered}$

Therefore, the variables are equal to x = 18, y = 7.5, and z = 7.