The Hyperbola Shown in the Calculator-Generated Graph Was Graphed in Function

Multiple Choice

The hyperbola shown in the calculator-generated graph was graphed in function mode with a square viewing window. What are the two functions $y_{1}$ and $y_{2}$ that were used to obtain the graph whose equation is given?
- $\frac{y^{2}}{49}-\frac{x^{2}}{9}=1$

A) $y_{1}=7 \sqrt{\frac{x^{2}}{9}-1}, y_{2}=-7 \sqrt{\frac{x^{2}}{9}-1}$
B) $y_{1}=7 \sqrt{\frac{x^{2}}{9}+1}, y_{2}=-7 \sqrt{\frac{x^{2}}{9}+1}$
C) $y_{1}=7 \sqrt{x^{2}-9}, y_{2}=-7 \sqrt{x^{2}-9}$
D) $y_{1}=3 \sqrt{x^{2}+7}, y_{2}=-3 \sqrt{x^{2}+7}$