(-6,5) and (6,-1) in point slope form

Carlos is making a small sign in the shape of a triangle for her store. he wants the base length of the triangle to be 6 inches. the area of the sign must be more than 15 square inches. (the sign has to be seen from the sidewalk.) write an inequality that describes the possible heights (in inches) of the triangle. use h for the height of the triangular sign.