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Mathematics 14 Online
OpenStudy (anonymous):

M and L are midpoints of AB and AC

OpenStudy (anonymous):

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OpenStudy (anonymous):

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OpenStudy (math_genius123):

whats the Q.

OpenStudy (anonymous):

find x and y

OpenStudy (anonymous):

i just dont know the equation

OpenStudy (math_genius123):

damn idk

OpenStudy (anonymous):

@mathmale

OpenStudy (mathmale):

Without actually going through the proofs, I'd say that the 2 triangles you see in this picture are SIMILAR. If that's the case, then Angles ABC and AML are equal. What equation in x and y does that give you?

OpenStudy (anonymous):

i have no idea how to set up the equation

OpenStudy (anonymous):

@mathmale

OpenStudy (anonymous):

oh its 2 equations would it be 10y+2+8x+32 and 12y-20=6x+2?

OpenStudy (mathmale):

Look carefully at the picture. Angle AML has measure (size) what?

OpenStudy (anonymous):

10y+2

OpenStudy (mathmale):

Right, and what about the measure of Angle ABC?

OpenStudy (anonymous):

8x+32

OpenStudy (mathmale):

Again, very good. Since these angles are equal, write the equation 8x+32 = ?

OpenStudy (anonymous):

8x+32 = 10y+2

OpenStudy (mathmale):

You're doing fine. Now, if we could come up with one more equation, we'll have enuf info from which to find x and y. Take another look at the picture and see if you can find any more info that we could use to set up another equation.

OpenStudy (mathmale):

Because of that word, "midpoint," we know that one of the triangles is twice the size of the other one. Does that help you at all?

OpenStudy (anonymous):

is it 6x+2=12y-20?

OpenStudy (anonymous):

no thats wrong

OpenStudy (mathmale):

You're certainly getting there. But look carefully: does it appear that ML has the same length as BC?

OpenStudy (mathmale):

If not, could you fix your equation?

OpenStudy (anonymous):

is ml half of bc?

OpenStudy (mathmale):

Yes. Very good. Now, how can you use that info to write a new, and correct, equation in x and y?

OpenStudy (anonymous):

10y+2=1/2(8x+32)

OpenStudy (mathmale):

As you said, ML is half of BC. This is the same as saying that 2ML = BC. What is ML? Multiply that by 2, then set the result equal to BC.

OpenStudy (mathmale):

Hint: BC = 12y-20.

OpenStudy (anonymous):

oh right i meant 10y+2=1/2(12y-20)

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