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1. Evaluate a + b if a = 7 and b = 3. a + b = 2. Evaluate a - b if a = 8 and b = 2. a - b = 3. Evaluate ab if a = 3 and b = -5. ab = 4. Evaluate 2a + b if a = 4 and b = -8. 2a + b = 5. Evaluate abc if a = 4, b = 5 and c = 2. abc = 6. Evaluate y - z if y = -2 and z = -6. y - z = 7. Evaluate mx + b if m = -2, x = 4 and b = -3. mx + b = 8. Evaluate x - xy if x = -2 and y = 3. x - xy = |