The operation * on the set R of real number is defined by x * y = 3x + 2y − 1, find 3* − 1
A
9
B
- 9
C
6
D
- 6
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
x * y is an operation on 3x + 2y − 1
Find 3A − 1
x = 3, y = −1
3 * − 1 on 3x + 2y − 1
3(3) + 2(−1) −1
= 9 − 2 − 1
= 6
Source: Myschool Past Questions Archive (Record #46361)