Find the value of (y) from (x+4y=18) and (x=2).
Answer and explanation
Correct answer: \(y=4\)
Given \(x=2\), substitute it into \(x+4y=18\): \(2+4y=18\). Thus, \(4y=16\), so \(y=4\). If \(y=3\), the left-hand side becomes \(2+12=14\), not 18. Exam tip: after substitution, transpose the constant term first and then divide by the coefficient of \(y\).
Frequently asked questions
What is the correct answer to this question?
\(y=4\)
Why is this the correct answer?
Given \(x=2\), substitute it into \(x+4y=18\): \(2+4y=18\). Thus, \(4y=16\), so \(y=4\). If \(y=3\), the left-hand side becomes \(2+12=14\), not 18. Exam tip: after substitution, transpose the constant term first and then divide by the coefficient of \(y\).
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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