Okay well, just by looking at the graph. It’s a negative slope and the only answer, that has a negative is the 3 one.
They are same side interior angles and same side interior angles are supplementary (add up to 180 degrees).
So, 6x+12+4x+18=180
Combine like terms:
10x+30=180
Subtract 30 from both sides:
10x=150
Divide both sides by 10:
x=15.
Therefore, the angles are same-side interior angles and x=15.
Answer is D. Show that AC and BC bisect each other and meet at the same point