Asystem of equations is graphed on the coordinate plain y=-2x-4 y=2x+4, what is the solution to the system of equations, enter the coordinates of the solution in the boxes

Since the slopes are different, the 2 lines intersect.  Elim. y by setting 
y = -2x - 4 equal to 2x + 4:  -2x - 4 = 2x + 4.

Then 4x = 8, and x =2.    Then y = -2(2) -4 = -8.

The solution is (2, -8).

I can help you with #20. For example, lets say 3/5, this fraction would be made up of 5 parts and 3 are covered, which doesn't make it full, if it was 5/5 it would be full. When you do something with a reciprocal you turn it over, so 3/5 would be turned over to 5/3, thus making it a whole number