Answer:
a real number
Step-by-step explanation: You didn't list the choices- a real number is all positive numbers except 0
Solve the top equation to get on variable on one side
2x-y=6
-y=-2x+6
y=2x-6
then plug in the coordinate for x and y for both equations. if both equations are true then it’s a solution
2=2(2)+6
2=10
4+2=6
so it’s not a solution
I'm sorry this is gauge is there anymore info
12 16/56 + 3 35/56 = 15 51/56
Polynomial :



The rest are not polynomials.
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I hope that helps you out!!
Any more questions, please feel free to ask me and I will gladly help you out !
~Zoey