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In triangle ABC, DE is midline parallel to CB. If DE = 3x+1 and CB = 7x -1 how long is DE?

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Paulsmith091viz

Answer:

10

Step-by-step explanation:

De is the midline which is half of the base ( BC ) .,.

7×1 = 2 ( 3 × 1 )

7×1 = 6 × + 2

× 3...

Substituting × to express

DE = 3 ( 3 ) + 1 = 10...

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