Answer:
(-9,2); A
Step-by-step explanation:
Move x to the right side of the equation and add together to remove x
3y=15+x
+( 7y=5-x)
10y=20, solve for y, y=2, now plug y into either equation to solve for x
3(2)=15+x
6=15+x
x=-9, the final answer is (-9,2) or A
