lala365
how do you find the length of CD?



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lala365
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dw:1354672985724:dw




lala365
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that is a 2. srry

VeritasVosLiberabit
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or Im sorry dont multiply by two, just solve for x and plugin the x in the equation for line CD and you have your answer.

lala365
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but how do i do that?

VeritasVosLiberabit
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use the equation i gave you above.

VeritasVosLiberabit
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you see that both line segments CD and AD are congruent, therefore you can set them equal to each other and solve for x.

lala365
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oh ok.so then i would multiply the 2x and 4x together?

VeritasVosLiberabit
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no you will need to use the opposite operations in order to isolate x.

lala365
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so i divide? them

VeritasVosLiberabit
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no not divide, try again.

VeritasVosLiberabit
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you can also see it as 4+2x = 4x

lala365
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add them

lala365
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but how does that = 4x?

VeritasVosLiberabit
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no not add look at you signs

VeritasVosLiberabit
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the line segment CD = AD therefore they are equal.

VeritasVosLiberabit
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the two lines you drew in the middle of them means they are the same length.

lala365
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so im not understanding. im so sorry. how do i solve the problem then?

VeritasVosLiberabit
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How do you think you would attempt it? I've pretty much given you all of the information and even how to setup the problem.

lala365
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2x+4=4x . i multiply the 2x and 4x to get 8x?

VeritasVosLiberabit
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no you need to subtract 2x from 4x

VeritasVosLiberabit
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rearrange your equation to see this better. 4+2x = 4x

lala365
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so 2x?

VeritasVosLiberabit
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write your whole equation.

lala365
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4+2x=4x

VeritasVosLiberabit
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now subtract 2x from both sides of your equation.

VeritasVosLiberabit
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and rewrite what you get.

lala365
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x+4=2x

VeritasVosLiberabit
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not quite. that extra x on the left should not be there so it should be 4 = 2x

VeritasVosLiberabit
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now one more step to solve for x

lala365
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i divide it by 2 right?