Question

If M is a midpoint of segment AB and AM=3x+1, if AB=20 cm what is the value of x?

Answer 1

AB=20 then AM =10

now,

`3x + 1 = 10 \\ 3x = 10 - 1 \\ 3x = 9 \\ x = 3`

Answer 2

x = 3

Explanation:

AB is the line segment and is 20 cm

Since M is the midpoint, AM = MB = 20/2 = 10

3x + 1 = 10

==> 3x = 10- 1 = 9

==> x = 9/3 = 3