Finding the slope using two points:
The formula for slope is
In this case...
(-4, 3) and (5, 3)
^^^Plug these numbers into the formula for slope...

B. 0
^^^This is your slope
Hope this helped!
~Just a girl in love with Shawn Mendes
we know that
the fourth point is plotted 5 units to the right of (-4,4)
so
the coordinate x of the fourth point is equal to
-4+5=1
the y-coordinate of the fourth point is the same y coordinate of (-4,4)
therefore
the coordinates of the fourth point is (1,4)
The answer is :
Y-21=-21/11 (X -7)