Monday

November 24, 2014

November 24, 2014

Posted by **Francesca** on Tuesday, October 11, 2011 at 7:55pm.

20x ≡ 9 (mod 15)

- Math -
**Steve**, Wednesday, October 12, 2011 at 4:58amLet x=1

20 ≡ 5 (mod 15)

As x increases by 1, the residue increases by 5, so no integer value of x satisfies the equation.

If you allow rational values for x, then it is easy to find many such x's: 9/20 comes to mind first...

**Answer this Question**

**Related Questions**

math - Which two is true as i'm confused A) 3+7 10 mod 15 17 + 9 4 mod 21 ...

Math - Which Statements of congruence are true and which are false and why? 177 ...

math - Which Statements of congruence are true and which are false and why? 177 ...

Math - Which Statements of congruence are true and which are false and why? 177 ...

math - how do we find the least residue of 1789 (mod 4), (mod 10), (mod 101)

math - how do we find the least residue of 1789 (mod 4), (mod 10), (mod 101)

DISCRETE MATHS - Prove that if n is an odd positive integer, then 1 ≡ n2 (...

Discrete Mathematics - Prove that if n is an odd positive integer, then 1 ≡...

Math - Using 10^n = x (mod 9). Given that d=2935107 =2*10^6 + 9*10^5 + 3*10^4 + ...

probability - how do we find the least residue of 1789 (mod 4), (mod 10), (mod ...