Testing for Symmetry In Exercises 33-40, use the algebraic tests to check for symmetry with respect to both axes and the origin.
33. x²-y=0
34. x-y=0
35. y = x³
36. y=x+3 37. y = x / x^2 + 1 38. y = 1/x^2 + 1 39. xy2+10=0
40. xy = 4