To check if this is the answer you can multiply the first number of each of these ratios by 5. (We multiply them by five because it is the second number in the ratio 1:5)
8 times 5 equals 40 -so this one is right
6 times 5 equals 30 -yep this one is right too
2 times 5 equals 10 -yeperdoodle
Yeah..so these are the answers! let me know if this helps you out.
C is the most reasonable answer because to add the system of equations together, you must make sure that one of the terms (whether it be the x or y value) can cancel out.