Short Answer A
Remark
These two equations have been set up so that all you have to do is add them in the first step.
Step One
3x + 6y = 36
3x - 6y = 0 Add them The 6ys will cancel out.
6x = 36
Step Two
Divide by 6
6x/6 = 36/6
x = 6
Step three
Use the original first equation to solve for y
3x + 6y = 36 Substitute 6 for x
3(6) + 6y = 36
18 + 6y = 36 Subtract 18 from both sides.
6y = 36 - 18
6y = 18 Divide by 6
6y/6 = 18/6
y = 3
Conclusion
The solution to these two equations is (6,3)
Answer
A