Question 760865
Using y2 - y1/x2 - x1
    = -5/7 -(-1/4)/ 2/7 -(-3/4)
    = -5/7 + 1/4/ 2/7 + 3/4
    = -13/28 / 29/28
    = -13 * 28/28 * 29
Cancel '28's'
    = -13/29
This is the slope.
Hope this helps.
:-)