यदि (7x+3y=42) और (21x+9y=k) की रेखाएं संपाती हों, तो (k) का मान क्या होगा?
If the lines (7x+3y=42) and (21x+9y=k) are coincident, what will be the value of (k)?
Explanation opens after your attempt
Correct Answer
C. (126)
Concept
The second equation must be (3) times the first, so (k=126). In coincident lines, the constant term also changes in the same ratio.
Why this answer is correct
The correct answer is C. (126). The second equation must be (3) times the first, so (k=126). In coincident lines, the constant term also changes in the same ratio.
Exam Tip
दूसरा समीकरण पहले का (3) गुना होना चाहिए, इसलिए (k=126)। संपाती रेखाओं में स्थिर पद भी उसी अनुपात में बदलता है।
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