# Math

Given ray OC is perpendicular to ray OA and <DOA=135 degrees,what would be the measure of <DOC given that <COB=3x-7 and <BOA= -2x+4.

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3. 👁 164

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👩‍🏫
Ms. Sue
2. I'm getting x=138.Is that true?

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3. not likely. How did you figure it?

If x=138, -2x+4 = -272

not likely one of the angles

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4. Then I don't know how to do it.Can you please show me?I don't get it.

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5. It seems that point B is irrelevant.
<AOC = 90
<AOD = 135
So, <COD = 45

As for finding x, it seems that
<COB + <BOA = 90
3x-7 + (-2x+4) = 90
x-3 = 90
x = 93
But that makes no sense, since then <BOA is negative.

If you lay out the diagram, with point A at the left, do points A,B,C,D progress left-to right?

If not, then describe the diagram more fully. Which are adjacent angles?

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