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Help! Find the value of x for which ABCD must be a parallelogram.
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Help!
Find the value of x for which ABCD must be a parallelogram.

Help! Find the value of x for which ABCD must be a parallelogram.-example-1
User Gabriel Durac
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1 Answer

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3
In a parallelogram, the diagonals (the lines inside from corner to corner) bisect each other. That means the two halves of the diagonal are equal to each other.
So
-9-6x=x-30
-9-6x+6x=x-30+6x
-9=7x-30
21=7x
x=3
User Yurii Shylov
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