Solve for b. 9000-b=-11,000+b

b=10,000

Step-by-step explanation:

Regroup terms

Add b to both sides

Add 11,000 to both sides

Simplify by adding

Divide both sides by 2

Switch sides

Done.

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)

i would say c is the best answer, hope it's right!

good luck! =)

cutie~