Answer: 9
Explanation:
It is given that the two diagonals of a parallelogram bisect each other. Using this information, it is given that the parts of each line are congruent to each other (12 = x + 3, 9 = 2y -1).
We are asked to find x, so we will use this information and the equation we created with this information to solve.
Given:
12 = x + 3
Subtract 3 from both sides of the equation:
9 = x