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What is obtained by solving (5x+5y=50) and (x-y=4)?

Answer and explanation

Correct answer: (x=7,\ y=3)

The direct answer is option D: x=7 and y=3. First simplify 5x+5y=50 by dividing every term by 5; this gives x+y=10. The second equation is x-y=4. Add the two equations: (x+y)+(x-y)=10+4, so 2x=14 and x=7. Put x=7 into x+y=10: y=3. Option D therefore satisfies both equations. Option A gives x+y=10 but x-y=2, not 4. Option B gives x+y=10 but x-y=0. Option C gives x+y=10 but x-y=6. Thus those choices fail the second equation, while D passes both. Reducing common factors before elimination makes the arithmetic easier and lowers the chance of error. Remember that dividing an entire equation by the same nonzero number does not change its solution.

Related tags

Linear EquationsEliminationSimplificationEasyClass 10

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