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.

Question

anonymous · Answer

Use the midpoint formula. http://en.wikipedia.org/wiki/Midpoint

anonymous · Answer

Step 1.  x1 = 5, y1 = 3, x2 = 9, y2 = -7
Step 2. x= (5+9) y=(3-7)
                     2            2
Step 3. x=14 y=-4
                  2       2 
Step 4.  
Step 5. x = 7, y = -2 

In which step did Sam first make an error?

anonymous · Answer

never mind i got it, it was step number two because he used an incorrect formula

anonymous · Answer

I was also going to say Step 1 because he wrote the coordinates wrong into his formula.

anonymous · Answer

oh yea your right i just noticed lol, Thanks!

anonymous · Answer

You're very welcome.