Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

What is the solution of x/4 + y/5 = 6 and x - y = 4?

Answer and explanation

Correct answer: x = 136/9, y = 100/9

Direct answer: C, x=136/9 and y=100/9. First remove the fractions from x/4+y/5=6 by multiplying every term by 20, the least common multiple of 4 and 5. This gives 5x+4y=120. From x−y=4, write x=y+4. Substitution gives 5(y+4)+4y=120, so 9y+20=120, 9y=100, and y=100/9. Then x=y+4=100/9+36/9=136/9. Check: x−y=36/9=4, and x/4+y/5=34/9+20/9=54/9=6. Thus C is correct. A has a different difference between x and y and fails the second equation. B also gives x−y=36/9 but its first-equation value is wrong. C satisfies both equations exactly. D has x−y=36/9 as well, but its fractional sum is too large. The safest habit is to clear denominators first and then substitute without changing signs.

Related tags

Pair Of Linear EquationsSubstitution MethodFraction EquationsAlgebraic MethodsAlgebraic Methods: Substitution Method And Elimination Method.Algebraic Methods Substitution Method And Elimination MethodPair Of Linear Equations In Two VariablesMathema

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.