If (y=42+3x), what is the value of (y) at (x=6)?
Answer and explanation
Correct answer: 60
Given \(y=42+3x\), substitute \(x=6\): \(y=42+3(6)=42+18=60\). Hence, 60 is correct. The value 48 results from doing \(42+6\) and incorrectly omitting multiplication by 3. Exam tip: after substitution in a linear expression, perform multiplication before addition or subtraction.
Frequently asked questions
What is the correct answer to this question?
60
Why is this the correct answer?
Given \(y=42+3x\), substitute \(x=6\): \(y=42+3(6)=42+18=60\). Hence, 60 is correct. The value 48 results from doing \(42+6\) and incorrectly omitting multiplication by 3. Exam tip: after substitution in a linear expression, perform multiplication before addition or subtraction.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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