If (x-y=5) and (y=2), what will be the value of (x)?
Answer and explanation
Correct answer: \(x=7\)
Given \(y=2\), substitute it in \(x-y=5\): \(x-2=5\). Adding 2 to both sides gives \(x=7\), so option C is correct. For example, if \(x=6\), then \(6-2=4\), not 5. Exam tip: verify the obtained value by substituting it back into the original equation.
Frequently asked questions
What is the correct answer to this question?
\(x=7\)
Why is this the correct answer?
Given \(y=2\), substitute it in \(x-y=5\): \(x-2=5\). Adding 2 to both sides gives \(x=7\), so option C is correct. For example, if \(x=6\), then \(6-2=4\), not 5. Exam tip: verify the obtained value by substituting it back into the original equation.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Pair of Linear Equations in Two Variables. Topic: Algebraic methods: Substitution method and Elimination method..
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