In which function is the range equal to the domain? 1) y = 2
2) y=x?
3) y = log x
4) y = x

Me because some of question i don’t understand

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.

How is working backward similar to solving an equation?