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notka56 [123]
3 years ago
5

If DF = 170, find the value of x. Then find DE and EF. DE=3x + 20 EF=2x + 40

Mathematics
1 answer:
Julli [10]3 years ago
7 0

9514 1404 393

Answer:

  DE = 86

  EF = 84

Step-by-step explanation:

We assume that point E lies on segment DF, so that ...

  DE + EF = DF

  (3x +20) +(2x +40) = 170

  5x = 110 . . . . . . . . . . . . . . . collect terms, subtract 60

  x = 22 . . . . . . . . . . . . divide by 5

  DE = 3×22 +20 = 66 +20 = 86

  EF = 2×22 +40 = 44 +40 = 84

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