If we substituted the x and y values in all of these equations, these are the equations and sums we would get:
A: 18 + 54 = 72
B: 30 + 90 = 120
C: 36 + 81 = 117
D: 60 + 45 = 105
Because we now know all of the sums for these equations, we can rule out A, B, and C because they don't have the correct answer that we got when we evaluated the expression which was 105. The only possible option would be D.
