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Class 9MathematicsIntroduction to PolynomialsLinear growth and decayEasyLevel 38
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Which statement is correct for (y=35-7x)?

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Answer and explanation

Correct answer: It is linear decay

Here, the coefficient of x is -7. For every increase of 1 in x, the value of y decreases by 7, so it represents linear decay. In linear growth, the coefficient of x is positive. Exam tip: In y = a + bx, the sign of b indicates growth or decay.

Related tags

Linear DecayLinear EquationsNegative SlopePolynomialsGrade 9 Mathematics

Frequently asked questions

What is the correct answer to this question?

It is linear decay

Why is this the correct answer?

Here, the coefficient of x is -7. For every increase of 1 in x, the value of y decreases by 7, so it represents linear decay. In linear growth, the coefficient of x is positive. Exam tip: In y = a + bx, the sign of b indicates growth or decay.

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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  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)?
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  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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