Question

In the figure shown DE = 7x-13 and DF =3x+3 what is the length of DF?

Answer 1

Answer:

The length of DF is 15

Step-by-step explanation:

Since the two lines are equal, which is given by the markings on the triangle, then you can set the two lengths equal and find x.

7x - 13 = 3x + 3

4x - 13 = 3

4x = 16

x = 4

Now that we know x = 4, we can plug into the DF length to find its amount.

DF = 7x - 13

DF = 7(4) - 13

DF = 28 - 13

DF = 15