Home
Class 12
MATHS
The number of values of k for which the ...

The number of values of `k` for which the system of equations:
`kx+(3k+2)y=4k`
`(3k-1)x+(9k+1)y=4(k+1)` has no solution, are

A

`0`

B

`1`

C

`2`

D

`3`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the number of values of \( k \) for which the given system of equations has no solution, we will use the condition for inconsistency in a system of linear equations. The equations are: 1. \( kx + (3k + 2)y = 4k \) 2. \( (3k - 1)x + (9k + 1)y = 4(k + 1) \) ### Step 1: Identify coefficients From the equations, we can identify the coefficients: - For the first equation: - \( a_1 = k \) - \( b_1 = 3k + 2 \) - \( c_1 = 4k \) - For the second equation: - \( a_2 = 3k - 1 \) - \( b_2 = 9k + 1 \) - \( c_2 = 4(k + 1) = 4k + 4 \) ### Step 2: Apply the condition for no solution The system of equations has no solution if: \[ \frac{a_1}{a_2} = \frac{b_1}{b_2} \neq \frac{c_1}{c_2} \] ### Step 3: Set up the first ratio Calculating \( \frac{a_1}{a_2} \): \[ \frac{a_1}{a_2} = \frac{k}{3k - 1} \] Calculating \( \frac{b_1}{b_2} \): \[ \frac{b_1}{b_2} = \frac{3k + 2}{9k + 1} \] Setting these two ratios equal: \[ \frac{k}{3k - 1} = \frac{3k + 2}{9k + 1} \] ### Step 4: Cross-multiply Cross-multiplying gives: \[ k(9k + 1) = (3k + 2)(3k - 1) \] Expanding both sides: \[ 9k^2 + k = (9k^2 - 3k + 6k - 2) = 9k^2 + 3k - 2 \] ### Step 5: Simplify the equation Subtract \( 9k^2 \) from both sides: \[ k = 3k - 2 \] Rearranging gives: \[ k - 3k = -2 \implies -2k = -2 \implies k = 1 \] ### Step 6: Check the second condition Now we need to check the second condition: \[ \frac{c_1}{c_2} = \frac{4k}{4k + 4} \] We need to ensure: \[ \frac{3k + 2}{9k + 1} \neq \frac{4k}{4k + 4} \] Calculating \( \frac{c_1}{c_2} \): \[ \frac{c_1}{c_2} = \frac{4k}{4(k + 1)} = \frac{k}{k + 1} \] ### Step 7: Set up the inequality We need: \[ \frac{3k + 2}{9k + 1} \neq \frac{k}{k + 1} \] Cross-multiplying gives: \[ (3k + 2)(k + 1) \neq (9k + 1)k \] Expanding both sides: \[ 3k^2 + 3k + 2k + 2 \neq 9k^2 + k \] \[ 3k^2 + 5k + 2 \neq 9k^2 + k \] Rearranging gives: \[ 0 \neq 6k^2 - 4k - 2 \] ### Step 8: Factor the quadratic Factoring \( 6k^2 - 4k - 2 \): \[ 3k^2 - 2k - 1 = 0 \] Using the quadratic formula: \[ k = \frac{-(-2) \pm \sqrt{(-2)^2 - 4 \cdot 3 \cdot (-1)}}{2 \cdot 3} \] \[ k = \frac{2 \pm \sqrt{4 + 12}}{6} = \frac{2 \pm 4}{6} \] This gives: \[ k = 1 \quad \text{or} \quad k = -\frac{1}{3} \] ### Conclusion Thus, the values of \( k \) for which the system has no solution are \( k = 1 \) and \( k = -\frac{1}{3} \). Therefore, the number of values of \( k \) for which the system has no solution is: **Answer: 2**

To determine the number of values of \( k \) for which the given system of equations has no solution, we will use the condition for inconsistency in a system of linear equations. The equations are: 1. \( kx + (3k + 2)y = 4k \) 2. \( (3k - 1)x + (9k + 1)y = 4(k + 1) \) ### Step 1: Identify coefficients From the equations, we can identify the coefficients: - For the first equation: ...
Promotional Banner

Topper's Solved these Questions

  • TEST PAPERS

    RESONANCE ENGLISH|Exercise Math|105 Videos
  • TEST PAPER

    RESONANCE ENGLISH|Exercise MATHEMATICS|48 Videos
  • TEST SERIES

    RESONANCE ENGLISH|Exercise MATHEMATICS|132 Videos

Similar Questions

Explore conceptually related problems

The number of values of k, for which the system of eauations: (k+1)x+8y=4k kx+(k+3)y=3k-1 has no solution is,

The number of values of k for which the system of the equations (k+1)x+8y=4k and k x+(k+3)y=3k-1 has infinitely many solutions is 0 b. 1 c. 2 d. infinite

The number of values of k, for which the system of equations (k""+""1)x""+""8y""=""4k k x""+""(k""+""3)y""=""3k-1 has no solution, is (1) 1 (2) 2 (3) 3 (4) infinite

The number of values of k, for which the system of equations (k""+""1)x""+""8y""=""4k k x""+""(k""+""3)y""=""3k-1 has no solution, is (1) 1 (2) 2 (3) 3 (4) infinite

The value of k for which the system of equations x+2y-3=0 and 5x+k y+7=0 has no solution, is (a) 10 (b) 6 (c) 3 (d) 1

Write the value of k for which the system of equations x+y-4=0 and 2x+k y-3=0 has no solution

Write the value of k for which the system of equations 3x-2y=0 and k x+5y=0 has infinitely many solutions.

The value of k for which the system of equations 2x+3y=5,\ \ \ \ 4x+k y=10 has infinite number of solutions, is (a) 1 (b) 3 (c) 6 (d) 0

Find all values of x, y and k for which the system of equations. sinx cos2y = k^(4)-2k^(2)+2 cosx sin2y=k+1 has a solution.

If the system of equations 3x+y=1,\ \ (2k-1)x+(k-1)y=2k+1 is inconsistent, then k=

RESONANCE ENGLISH-TEST PAPERS-MATHEMATICS
  1. The extremities of the diagonal of a rectangle are (-4, 4) and (6,-1)....

    Text Solution

    |

  2. In a city no two persons have identical set of teeth and there is n...

    Text Solution

    |

  3. The number of values of k for which the system of equations: kx+(3k+...

    Text Solution

    |

  4. If ain[-20, 0], find the probability that the graph of the function y=...

    Text Solution

    |

  5. about to only mathematics

    Text Solution

    |

  6. Let f(x)=int2^x (dt)/sqrt(1+t^4) and g be the inverse of f. Then, the...

    Text Solution

    |

  7. If f : R rarr R is a function defined by f(x) = [x] cos ((2x -1)/(2))p...

    Text Solution

    |

  8. Let f(x)=underset(ntooo)lim(1)/(((3)/(pi)tan^(-1)2x)^(2n)+5). Then the...

    Text Solution

    |

  9. Area bounded by the region R-={(x,y):y^(2)lexle|y|} is

    Text Solution

    |

  10. The range of the function, f(x)= (1+sec^-1x) (1 + cos^-1 x) is

    Text Solution

    |

  11. If a, b, c are distinct odd integers and omega is non real cube root o...

    Text Solution

    |

  12. Consider the following equation in x and y: (x-2y-1)^2 + (4x+3y-4)^2 +...

    Text Solution

    |

  13. If f(n)=int(0)^(2015)(e^(x))/(1+x^(n))dx, then find the value of lim(n...

    Text Solution

    |

  14. The statement ~(~prarrq) is equivalent to (A) pvv~q ...

    Text Solution

    |

  15. The median of a set of nine distinct observations is 20.5. If each of ...

    Text Solution

    |

  16. In DeltaABC, if AB=5cm, BC=13cm and CA=12cm, then the distance to vert...

    Text Solution

    |

  17. A relation R is defined on the set of circles such that "C(1)RC(2)impl...

    Text Solution

    |

  18. If A=[{:(1,-1,1),(0,2,-3),(2,1,0):}] and B=(adjA) and C=5A, then find ...

    Text Solution

    |

  19. If f(x) is a differentiable function satisfying f^(')(x)lt2 for all xe...

    Text Solution

    |

  20. If A(1,p^(2)),B(0,1) and C(p,0) are the coordinates of three points th...

    Text Solution

    |