Math help!!?

Question

1. The midpoint of segment AB, AM=4x and AB=7x+9. What is the value of MB? Please show work

2. The measure of angle ABD is represented by 6y+1.
The measure of angle DBC is represented by 4y-7.
The measure of angle ABC is represented by 9y+3.
Find the value of y and the measures of angles ABD, DBC, and ABC. Please show work

Answer 1

M is midpont
AM = BM (definition of midpoint)
AB = AM + BM = 2*AM
7x + 9 = 2(4x)
7x + 9 = 8x
9 = x
MB = 4x = 4*9 = 36

or
MB = AB - AM
MB = (7x+9) - 4x = 3x+9
and then solve for x, same answer

2. I need a diagram. This is some form of four-sided figure or a triangle with a fourth point somewhere.