If (y=42-2.5x), what is (y) at (x=8)?
Advertisement
Answer and explanation
Correct answer: 22
Substitute x=8 into the given equation: y=42-2.5×8. Since 2.5×8=20, y=42-20=22. Therefore, 22 is the correct option. A result such as 24 may arise from an error in multiplication or subtraction. Exam tip: First multiply the decimal coefficient by x, then subtract from the constant term.
Frequently asked questions
What is the correct answer to this question?
22
Why is this the correct answer?
Substitute x=8 into the given equation: y=42-2.5×8. Since 2.5×8=20, y=42-20=22. Therefore, 22 is the correct option. A result such as 24 may arise from an error in multiplication or subtraction. Exam tip: First multiply the decimal coefficient by x, then subtract from the constant term.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
Advertisement