A highway is shown as a straight line on a coordinate grid. One end of the highway is located at (5, 9) and the other end is located at (3, -7). Sam performed the steps shown to find the coordinates of the midpoint of the highway.

Step 1. x1 = 5, y1 = 3, x2 = 9, y2 = -7
Step 2.
Step 3.
Step 4.
Step 5. x = 7, y = -2

In which step did Sam first make an error?
Answer
Step 1, because he used the incorrect values for values for x2 and y1.
Step 2, because he used the incorrect formula to find the midpoint.
Step 3, because he changed the positive sign to a negative sign to f

Question

A highway is shown as a straight line on a coordinate grid. One end of the highway is located at (5, 9) and the other end is located at (3, -7). Sam performed the steps shown to find the coordinates of the midpoint of the highway.

Step 1.  x1 = 5, y1 = 3, x2 = 9, y2 = -7
Step 2. 
Step 3. 
Step 4.  
Step 5. x = 7, y = -2 

In which step did Sam first make an error?
Answer
		Step 1, because he used the incorrect values for values for x2 and y1.
		Step 2, because he used the incorrect formula to find the midpoint.
		Step 3, because he changed the positive sign to a negative sign to f