Question

In the diagram below of triangle BCD,

E is the midpoint of BD and F is the
midpoint of CD. If EF = -9x + 82,
and BC= 80 - 6x, what is the measure
of BC?
B
E
Answer:
BC=
D
Submit Answer
F
attempt 2 out of 100
с

Answer 1

808

Explanation:

In this case, BC is 2EF so first we’ll solve for x so set them equal to each other so -9x+82=80-6x

then simple algebra leads us to 162=3x and x = 54

EF equals 404 so BC equals 808