passpadi

2017

Mathematics

JAMB

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

Correct Answer: 6

Explanation

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

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
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