2015 · Q21
The number of pairs (x, y) where x, y are integers satisfying the equation 21+48y=5 is
Elementary MathematicsPercentages
- AZero
- BOne
- CTwo
- DInfinity
Explanation
gcd(21, 48) = 3 does not divide 5, so 21x + 48y = 5 has no integer solutions: zero pairs. Hence option (a).