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Find the least value of x which satisfies the equation 4x = ...
math waec-mathematics-2020 waec-2020 ssce-exam-2020
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Find the least value of x which satisfies the equation 4x = 7 (mod 9)

A. 7

B. 6

C. 5

D. 4

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judziy
Asked by judziyrep:1.9K
University of Benin Nigeria
18 August 2020

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james_mark
James_mark answeredrep:728
School not set Nigeria
20 January 2021
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4x = 7

divide both sides by 4

x = 7/4 = 1.75

But in linear congrugrence, negative or decimal values are not allowed, so, we add 9 to the initial equation (because it's in mod 9)

4x = 7 + 9

4x = 16

divide both sides by 4

x = 16/4

x = 4

Ans D

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