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Question

The system of equations 

\(2x-3y-5 = 0\), \(15y-10x + 50 = 0\)

This question was previously asked in
NDA 2 2025 GAT Question Paper (14-Sep-2025)
The correct answer is
is inconsistent

Understanding the System of Equations

We are given a system of two linear equations:

  • Equation 1: \(2x - 3y - 5 = 0\)
  • Equation 2: \(15y - 10x + 50 = 0\)

Rewriting Equations in Standard Form

To analyze the system, let's rewrite both equations in the standard form \(Ax + By = C\).

  • Equation 1 can be written as: \(2x - 3y = 5\) Here, \(A_1 = 2\), \(B_1 = -3\), and \(C_1 = 5\).
  • Equation 2 can be rearranged as: \(-10x + 15y = -50\) Here, \(A_2 = -10\), \(B_2 = 15\), and \(C_2 = -50\).

Determining the Nature of Solutions

We can determine if a system of linear equations \(A_1x + B_1y = C_1\) and \(A_2x + B_2y = C_2\) has a unique solution, infinitely many solutions, or no solution (inconsistent) by comparing the ratios of their coefficients:

  • Unique Solution: If \(\frac{A_1}{A_2} \neq \frac{B_1}{B_2}\). The lines intersect at a single point.
  • Infinitely Many Solutions: If \(\frac{A_1}{A_2} = \frac{B_1}{B_2} = \frac{C_1}{C_2}\). The lines are coincident (the same line).
  • Inconsistent (No Solution): If \(\frac{A_1}{A_2} = \frac{B_1}{B_2} \neq \frac{C_1}{C_2}\). The lines are parallel and distinct.

Analyzing the Coefficient Ratios

Let's calculate the ratios for the given system:

  • Ratio of x-coefficients: \(\frac{A_1}{A_2} = \frac{2}{-10} = -\frac{1}{5}\)
  • Ratio of y-coefficients: \(\frac{B_1}{B_2} = \frac{-3}{15} = -\frac{1}{5}\)
  • Ratio of constant terms: \(\frac{C_1}{C_2} = \frac{5}{-50} = -\frac{1}{10}\)

Now, let's compare these ratios:

We observe that \(\frac{A_1}{A_2} = -\frac{1}{5}\) and \(\frac{B_1}{B_2} = -\frac{1}{5}\). So, \(\frac{A_1}{A_2} = \frac{B_1}{B_2}\).

However, when we compare this to the ratio of the constant terms, we see that \(-\frac{1}{5} \neq -\frac{1}{10}\). Therefore, \(\frac{A_1}{A_2} = \frac{B_1}{B_2} \neq \frac{C_1}{C_2}\).

Conclusion

According to the conditions for analyzing systems of linear equations, the relationship \(\frac{A_1}{A_2} = \frac{B_1}{B_2} \neq \frac{C_1}{C_2}\) indicates that the system of equations is inconsistent. This means there are no values of \(x\) and \(y\) that can satisfy both equations simultaneously, as the lines represented by the equations are parallel.

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Important Questions from Linear Equation in 2 Variable

  1. If 2 x + 3 y = 17;

    2 x+2  - 3 y+1  = 5

    then the values of x and y are:

  2. The solution of pair of linear equations \(\dfrac{1}{2}x+\dfrac{2}{3}y=-1,x-\dfrac{1}{3}y=3\) by the elimination method, is:

  3. Kumar tried his skill at shooting at a fun fair. He has to hit the target and if he hits the target he gets 1 Rs. and if he misses he has to pay 50 paise. He attempted 25 shots and won 10 Rs. In how many did he hit the target?

  4. Shyam spent half of his money and was left with as many as he had rupees before, but with half as many rupees as he had paise before. Which of the following is a possible amount of money he is left with?

  5. Two bus tickets from city A to B and three tickets from city A to C cost Rs. 77, but three tickets from city A to B and two tickets from city A to C cost Rs. 73. What are the fares for cities B and C from A?

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