In MN is x-1 and LM in 6x-18, what is LM?

MN is equale to half of LM but I don't know how to find the answer, Ive tried and they all were wrong Please help now
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1 Answer

Half the length LM=(6x-18)/2=3x-9. So the length of MN=3x-9.

But the length of MN is also x-1, therefore x-1=3x-9, 9-1=3x-x, 8=2x, 4=x, that is, x=4.

CHECK

LM is 6x-18=24-18=6 units long. MN is therefore 3 units long (half of LM), which is also x-1=4-1=3.

by Top Rated User (1.1m points)

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