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Mathematics 7 Online
Sarah10:

geom help needed

Sarah10:

http://prntscr.com/i0h4h8

Zepdrix:

Hmm I don't remember my geom's so well >.< But I think like uhhhh.. since these lines are parallel on the ends... these ratios will be equivalent:|dw:1515973375656:dw|The ratio of AE to AB should be equivalent to the ratio DE to CD because of... math.

Zepdrix:

\[\large\rm \frac{2x+10}{10}=\frac{x+3}{4}\]

Zepdrix:

And the do some maths to solve for x. To get rid of the denominators, multiply by the LCM of 10 and 4 which is 20. \[\large\rm 20\left(\frac{2x+10}{10}\right)=20\left(\frac{x+3}{4}\right)\]giving us,\[\large\rm 2(2x+10)=5(x+3)\]And then a few steps after that should lead to x. Think you can finish it up miss Sarah? :o I thinkkkk these are the right steps, it just... feels right.

Sarah10:

thank youu!

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