Practice30Create account

The pair of equations and has infinitely many solutions when equals:

Competition practiceAlgebra
  • A3
  • B6
  • C−6
  • D2

Step-by-Step Solution

Infinitely many solutions need a₁/a₂ = b₁/b₂ = c₁/c₂. Here 2/4 = 1/2 and 5/10 = 1/2, so 3/k = 1/2 gives k = 6 (the second equation is then just twice the first).
Answer: B) 6

Master this topic in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Algebra practice questions

More Algebra practice

For which value of k does the pair kx + 3y = k − 3 and 12x + ky = k have no solution?The pair of equations x − 2y = 8 and 5x − 10y = 10 is:The sum of the digits of a two-digit number is 9. When 27 is added to the number, its…Five years ago a father was three times as old as his son. Ten years from now he will be…A fraction becomes 1/3 when 1 is subtracted from its numerator, and it becomes 1/4 when…