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Monica [59]
3 years ago
5

Find the value of the variable and DF if D is between C and F if CD 4y -9, DF 2y-7, and CF 14.

Mathematics
1 answer:
Yuri [45]3 years ago
4 0
CF = CD + DF (since D is simply a point on the line, and C to that point added onto F to that point is CF), so 4y-9+2y-7=14. Adding it up, we get 6y-16=14 and adding by 16 we get 30=6y. Dividing both sides by 6, we get y=5. Plugging that into DF, we get 10-7=DF=3
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