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To solve the equation 63 + x = 9 using substitution, we substitute each number from the given set {6, 7, 8, 9} for x and see which one makes the equation true.
For x = 6:
63 + 6 = 69 ≠9
For x = 7:
63 + 7 = 70 ≠9
For x = 8:
63 + 8 = 71 ≠9
For x = 9:
63 + 9 = 72 ≠9
None of the numbers from the set {6, 7, 8, 9} make the equation 63 + x = 9 true.