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Question Number 92187 by jagoll last updated on 05/May/20

$$4\mathrm{x}=6\left(\mathrm{mod}10\right)$$

Commented by john santu last updated on 05/May/20

$$4\times 4=16=6\left(mod10\right)$$$$4\times 9=36=6\left(mod10\right)$$$$then4\mathrm{\&}9\mathrm{is}\mathrm{solution}$$

Answered by mr W last updated on 05/May/20

$$4x=10n+6=8n+4+2(n+1)$$$$n+1=2k$$$$n=2k-1$$$$4x=10(2k-1)+6=20k-4$$$$\Rightarrow x=5k-1=4,9,14,19,....$$

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