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If (y=28+5x), what is the value of (y) at (x=4)?
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Answer and explanation
Correct answer: 48
Given y=28+5x, substitute x=4: y=28+5(4)=28+20=48. Therefore, 48 is correct. Option 52 would result from incorrectly treating 5×4 as 24, whereas it equals 20. Exam tip: Substitute the given value for the variable and perform multiplication before addition.
Frequently asked questions
What is the correct answer to this question?
48
Why is this the correct answer?
Given y=28+5x, substitute x=4: y=28+5(4)=28+20=48. Therefore, 48 is correct. Option 52 would result from incorrectly treating 5×4 as 24, whereas it equals 20. Exam tip: Substitute the given value for the variable and perform multiplication before addition.
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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