Need help finding the (x) & (y) value

For which rational expression is -2 an excluded value of x?

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.

What is the slope of any line parallel to the line 8x+9y=3 in the standard (x,y) coordinate plane?