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Subjects
Class 9MathematicsIntroduction to PolynomialsLinear growth and decayMediumLevel 36
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If (y=7+1.5x), what is (y) at (x=10)?

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Answer and explanation

Correct answer: 22

Substituting x=10 gives y=7+1.5(10)=7+15=22. Therefore, the correct answer is 22. The value 18 may result from incorrectly adding or multiplying 7 and 1.5; here, 1.5 must first be multiplied by 10. Exam tip: after substitution, perform multiplication before addition or subtraction.

Related tags

Linear EquationsSubstitutionDecimal CoefficientsAlgebraic EvaluationPolynomials

Frequently asked questions

What is the correct answer to this question?

22

Why is this the correct answer?

Substituting x=10 gives y=7+1.5(10)=7+15=22. Therefore, the correct answer is 22. The value 18 may result from incorrectly adding or multiplying 7 and 1.5; here, 1.5 must first be multiplied by 10. Exam tip: after substitution, 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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  2. 2If the amount of water is (W(t)=50-4t) litres, what type of change is it?
  3. 3In the linear rule (C(d)=15+2d), what is the initial value?
  4. 4In the linear rule (P(t)=80-5t), what is the rate of change per unit?
  5. 5If (S(t)=10+6t), what will be the value of (S(t)) at (t=4)?
  6. 6If (M(t)=90-7t), what is the value of (M(t)) at (t=5)?
  7. 7Books in a library increase according to (B(n)=100+8n). What does the coefficient of (n) show?
  8. 8If water left in a tank is (L(t)=60-3t) litres, how much water was there at (t=0)?
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  10. 10Which rule represents linear decay?
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