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ZA and ZB are supplementary angles. If m A = (5x + 25)° and mZB = (3x + 19)°, then find the measure of ZB.

User NAbbas
by
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1 Answer

6 votes

We know that

• ZA and ZB are supplementary angles: This means their sum is equal to 180°.

Using the given information, we can express the following


m\angle ZA+m\angle ZB=180

Replacing the given expressions, we have


5x+25+3x+19=180

First, we reduce like terms


8x+44=180

Now, we subtract 44 on each side-


\begin{gathered} 8x+44-44=180-44 \\ 8x=136 \end{gathered}

Then, we divide the equation by 8


\begin{gathered} (8x)/(8)=(136)/(8) \\ x=17 \end{gathered}

We use this value to find the measure of angle ZB


m\angle ZB=3x+19=3(17)+19=51+19=70

Therefore, the measure of angle ZB is 70°

User MHibbin
by
6.6k points
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