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Mathematics 7 Online
silvernight269:

JK and JL are opposite rays and ray JM bisects angle KJL. if m angle MJK = (5x+15) degree, find the value of x.

silvernight269:

@dude

silvernight269:

@SmokeyBrown

Shadow:

Do we have a picture for this one

silvernight269:

no

Shadow:

Did you draw it out?

silvernight269:

im so confused with this and one other so no.

Shadow:

Lets start with this: |dw:1539311969228:dw| That is what 'opposite rays' look like

Shadow:

Does that make sense?

silvernight269:

well, i figured that much but then the nxt part of that sentence confused me so bad that i thought that the opposite rays are drawn differently

Shadow:

Quick question, do you know the angle of a straight line?

silvernight269:

180?

Shadow:

Correct

Shadow:

Do you know what bisect means?

silvernight269:

two cut in half

Shadow:

Then this should all make sense in a few moments.

Shadow:

So far we have 'JK and JL are opposite rays' drawn out. Lets focus on the next part which is: 'ray JM bisects angle KJ' |dw:1539312251715:dw|

Shadow:

'if m angle MJK = (5x+15) degree' Where is this angle on that picture. You can click the pencil in the top right corner of my drawing to draw on it.

silvernight269:

|dw:1539312344512:dw|

Shadow:

Correct. What do you think the measure of that angle is?

Shadow:

Let me know if you need a hint. But just try and see if you can get it yourself.

silvernight269:

90

Shadow:

Correct. Segment KL is perpendicular to segment JM. When lines are perpendicular, they create 90 degree angles.

Shadow:

Knowing that the angle is 90 degrees, what do you think you can do next?

Shadow:

Remember, the goal is to find the value of x

silvernight269:

90=5x+15

Shadow:

Correct. You know how to do that right?

silvernight269:

yes..

Shadow:

Okay cool

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