Question 708948
Since it is substitution, then you can let just set the two equations equal to themselves.  This will help you to solve for g.
h=-6g-4      h=-2g+28

-6g-4=-2g+28  Add 2g to both sides
-4g-4=28      Add 4 to both sides
-4g  =32      Divide both sides by -4
  g  =-8

Now use what you solved for g to solve for h.  It does not matter which equation you use.

h=-6g-4     Substitute -8 for g
h=-6(-8)-4
h=48-4
h=44
So now you have your value for h and g.  In other words your answer is (-8,44).