Download the app

Questions  

If the system of equations   x+y+z=5,        x+2y+3z=9 ,x+3y+αz=β  has infinitely many solutions , then  βα equals 

Remember concepts with our Masterclasses.

80k Users
60 mins Expert Faculty Ask Questions
a
8
b
18
c
21
d
5

Ready to Test Your Skills?

Check Your Performance Today with our Free Mock Tests used by Toppers!

detailed solution

Correct option is A

Since, the system of equations has infinitely many solution, therefore D=D1−D2−D3=0Here,D=11112313α=1(2α−9)−1(α−3)+1(3−2)=α−5 And D3=1    1    51    2    91    3    β=1(2β−27)−1(β−9)+5(3−2)and D3=11512913β=12β−27−1β−9+53−2=β−13 Now, D=0⇒   α−5=0  ⇒α=5 And  D3=0⇒β−13=0⇒β=13∴β−α=13−5=8


Similar Questions

If the system of equations ax + y= 3, x + 2y = 33x + 4y = 7 is consistent, then value of a is given by 


whats app icon
phone icon