Where,
x = 5 and y = 6
a) x + y - 9
To replace substitute 5 and 6 for x and y respectively.
Replace: 5 + 6 - 9
Evaluate: = 11 - 9 = 2
b) 3x + 2y
Replace: 3(5) + 2(6)
Evaluate: 15 + 12 = 27
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