Can someone please help me and please show your work. Will mark brainlist!

B

Step-by-step explanation:

k= x/y

8/4 = 2.00 (2)

12/4 = 3.00 (3)

20/4 = 5.00 (5)

30/4 = 7.50 (7.5)

50/4 = 12.50 (12.5)

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.

x= -3

step-by-step explanation:

step 1: simplify brackets

4 - x - 1 = 6

step 2: simpilfy

3 - x = 6

step 3: subtract 3 from both sides

-x = 6 - 3

step 4: simpilfy 6 - 3

-x = 3

step 5: multiply both sides by -1

x = -3