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If the lines (7x+3y=42) and (21x+9y=k) are coincident, what will be the value of (k)?यदि (7x+3y=42) और (21x+9y=k) की रेखाएं संपाती हों, तो (k) का मान क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (126)(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.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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