Answer:
(2,-1)
Explanation:
Welol to find the line of (3,7) and (2,-1) we need to use the following formula,

So -1 is y2 7 is y1 so -1 - 7 = -8
2-3 = -1
Hence, the slope of the line is 8.
And graphing more points on the graph using the slope we can see the y intercept is -17.
So the equation is y = 8x - 17
And the mid point is at (2, -1)