Useing substitution/elimination method what is the solution set to 2x+y=1

x^2=y+2
a)(-3,7) and (1,-1)
b)(3,7) and (-1,-1)
c)(-3,-7) and (1,1)
d)(3,-7) and (-1,1)

I've really no educated guess so PLEASE HELP!

You can make an educated guess by substituting the various (x,y) combinations and eliminating the ones that don't work.

For example, if x = 1 and y = 1, obviously the requirement 2x + y = 1 is not satisfied. Therefore you can eliminate (c)

That is probably what they mean by the "substitution/elimination" method. It's only useful when you are presented with multiple choices.