JEE Main 2024 · MathsMultiple choiceSingle correctMediumCalculation

JEE Main 8 April 2024, Shift 2, Maths Q3

Question 3 of 90 in this shift, Maths question 3 of 30, Section A.

If the system of equations

x + 4y - z = \lambda

7x + 9y + \mu z = -3

5x + y + 2z = -1

has infinitely many solutions, then

(2\mu + 3\lambda)

is equal to :

(1) $3$
(2) $-3$ Official answer
(3) $2$
(4) $-2$

Official answer

Option 2

NTA final key.

Chapter: Determinants
Topic: Cramer's Rule
Idea tested: Condition for Infinite Solutions

Same idea in other shifts

Asked 25× in all

2 Apr 2026, Shift 2 · Q3If the system of equations $x + 5y + 6z = 4,$ $2x + 3y + 4z = 7,$ $x + 6y + az = b$ has infinitely many solutions, then the point $(a, b)$ …MediumSingle correct
4 Apr 2026, Shift 2 · Q3If the system of equations: $x+y+z=5$ $x+2y+3z=9$ $x+3y+\lambda z=\mu$ has infinitely many solutions, then the value of $\lambda+\mu$ is:EasySingle correct
8 Apr 2026, Shift 2 · Q3If the system of linear equations : $x + y + z = 6$ , $x + 2y + 5z = 10$ , $2x + 3y + \lambda z = \mu$ has infinitely many solutions, then…EasySingle correct
2 Apr 2025, Shift 1 · Q20If the system of linear equations $3x+y+\beta z=3$ $2x+\alpha y-z=-3$ $x+2y+z=4$ has infinitely many solutions, then the value of…MediumSingle correct
5 Apr 2024, Shift 1 · Q4If the system of equations $11x+y+\lambda z=-5$ $2x+3y+5z=3$ $8x-19y-39z=\mu$ has infinitely many solutions, then $\lambda^4-\mu$ is equal…MediumSingle correct
5 Apr 2024, Shift 2 · Q4The values of $m, n$ , for which the system of equations $x+y+z=4$ , $2x+5y+5z=17$ , $x+2y+mz=n$ has infinitely many solutions, satisfy the…MediumSingle correct
6 Apr 2024, Shift 2 · Q22If the system of equations $2x+7y+\lambda z=3$ $3x+2y+5z=4$ $x+\mu y+32z=-1$ has infinitely many solutions, then $(\lambda-\mu)$ is equal…MediumNumerical value
9 Apr 2024, Shift 1 · Q3Let $\lambda,\mu\in\mathbf{R}$ . If the system of equations $3x+5y+\lambda z=3$ $7x+11y-9z=2$ $97x+155y-189z=\mu$ has infinitely many…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.