Solve the System by the Substitution Method $36 x^{2}+49 y^{2}=1764$ $7 y-6 x=42$

Multiple Choice

Solve the system by the substitution method.
- $36 x^{2}+49 y^{2}=1764$
$7 y-6 x=42$

A) $(0,6) ,(-7,0)$
B) $(0,7) ,(0,-6)$
C) $(0,-6) ,(7,0)$
D) $(0,-7) ,(6,0)$