Write an Equation for the Hyperbola $y ^ { 2 } - x ^ { 2 } = 35$

Multiple Choice

Write an equation for the hyperbola.
-The roof of a building is in the shape of the hyperbola $y ^ { 2 } - x ^ { 2 } = 35$ , where $x$ and $y$ are in meters. Determine the distance, $w$ , between the outside walls.
$$\mathrm { A } = 7 \mathrm {~m}$$

A) $3.75 \mathrm {~m}$
B) $9.2 \mathrm {~m}$
C) $14 \mathrm {~m}$
D) $7.5 \mathrm {~m}$