Question

solve for x if m is a midpoint.
a 12 m 3x - 9 b

Explanation:

Step1: Apply mid - point property

If M is the mid - point of segment AB, then AM = MB. So, we set up the equation 12=3x - 9.

Step2: Add 9 to both sides

12 + 9=3x-9 + 9, which simplifies to 21 = 3x.

Step3: Divide both sides by 3

$\frac{21}{3}=\frac{3x}{3}$, so x = 7.

Answer:

x = 7