Question

line l bisects the segment. find the value of x.

Explanation:

Step1: Set up equation

Since line l bisects the segment, the two parts are equal. So we set up the equation $3x + 6=15$.

Step2: Isolate the variable term

Subtract 6 from both sides of the equation: $3x+6 - 6=15 - 6$, which simplifies to $3x = 9$.

Step3: Solve for x

Divide both sides of the equation by 3: $\frac{3x}{3}=\frac{9}{3}$, so $x = 3$.

Answer:

D. $x = 3$