Graph the Equations to Determine Whether the System Has Any $$\left\{ \begin{array} { r } 3 x - y = 21 \\x ^ { 2 } - y ^ { 2 } = 49\end{array} \right.$$

Multiple Choice

Graph the equations to determine whether the system has any solutions. Find any solutions that exist. $$\left\{ \begin{array} { r } 3 x - y = 21 \\x ^ { 2 } - y ^ { 2 } = 49\end{array} \right.$$

A) $( - 7,0 ) \left( \frac { 28 } { 5 } , \frac { 21 } { 5 } \right)$
B) $( 7,0 ) \left( \frac { 35 } { 4 } , \frac { 21 } { 4 } \right)$
C) $( 0 , - 7 ) ( 28,7 )$
D) $( 0,7 ) ( - 7,42 )$
E) no solution exists