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Please answer this and thank you If DE=4x+10, EF=2-1, and DF=9x-15, find DF.
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Please answer this and thank you

If DE=4x+10, EF=2-1, and DF=9x-15, find DF.

Please answer this and thank you If DE=4x+10, EF=2-1, and DF=9x-15, find DF.-example-1
User DroidT
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1 Answer

3 votes
I hope that 2-1 means 21.

DE + EF = DF
4x + 10 + 21 = 9x - 15
4x + 31 = 9x - 15
31 = 9x - 4x - 15
31 = 5x - 15
46 = 5x
x = 9 1/5 = 9.2

You want 9x - 15
9*9.2 - 15
82.8 - 15
67.8 <<<<< answer.
If I have given the wrong meaning to 2-1 (which could mean 1) leave another note and I will correct my work.
User Marenz
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6.1k points
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