If you're not getting the answer choices to this restaurant, I'm not surprised. They aren't there. This problem needs to be retyped. Let's try anyway.
In order to solve for x, let's multiply the above equation by 7 and the below equation by 3. This will produce a 21y in both equations, which can then be easily subtracted out.
7x + 3y = 12
3x + 7y = 6
becomes
49x + 21y = 84
9x + 21y = 18
Subtracting we get
40x = 66
so
x = 66/40 = 33/20
Plugging that into one of the equations we will get 3/20 for y.
33/20 x
3/20 y
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