Can someone explain how to do this-

Which is a true statement comparing the graphs of x^2/6^2-y^2/8^2 = 1 and x^2/8^2-y^2/6^2 the foci of both graphs are the same points. the lengths of both transverse axes are the same. the directrices of = 1 are horizontal while the directrices of = 1 are vertical. the vertices of = 1 are on the y-axis while the vertices of = 1 are on the x-axis.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2