Solve the Problem $y^{2}-10 x^{2}=70$ , Where $x$ And $y$ Are in Meters $h$

Multiple Choice

Solve the problem. Round your answer to the nearest tenth.
-The roof of a building is in the shape of the top half of the hyperbola $y^{2}-10 x^{2}=70$ , where $x$ and $y$ are in meters. Refer to the figure and determine the height, $h$ , of the outside walls.

A) $74.0 \mathrm{~m}$
B) $8.6 \mathrm{~m}$
C) $710.0 \mathrm{~m}$
D) $26.6 \mathrm{~m}$