Evaluate b-\left(-\dfrac{1}{8}\right)+cb−(− 8
1

)+cb, minus, left parenthesis, minus, start fraction, 1, divided by, 8, end fraction, right parenthesis, plus, c where b = 2b=2b, equals, 2 and c = -\dfrac{7}{4}c=−
4
7

c, equals, minus, start fraction, 7, divided by, 4, end fraction.

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.