determine x so that the three points (x,-3),(9,1), and (13,2) will lie on a straight line.

Answer:
Explanation:
Let:
First, we use the slope formula:
Next, we find the slope from point 1 to point 2. So,
Then, we solve for x using the slope and points 2 and 3.
We can double check it by using all points:
Therefore, the answer is x = -7.