googoomylizard
29.09.2021 •
Mathematics
If DF = 9x - 39, find EF.
47
3x + 10
D
E
F
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Ответ:
|DF| = |DE| + |EF|
|EF| = 58
|DF| = 9x -36
|DE| = 47
|EF| = 3x+10
Substitute:
9x - 39 = 47 + 3x + 10
9x - 39 = 3x + 57 |+39
9x = 3x + 96 |-3x
6x = 96 |:6
x = 16
Put the value of x to the equation |EF| = 3x + 10
|EF| = (3)(16) + 10 = 48 + 10 = 58
- Amaya
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