If angle cfd= 12a + 45, find a so that fc is perpindicular to fd. i'm so confused..

What is the slope of a line that is perpendicular to y = 3x + 1

What is the value of x? enter your answer in the box. (cm)

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.