In the rule (y=85-10x), what does (10) represent?
Answer and explanation
Correct answer: Decrease of 10 per step
In
(y=85-10x), the coefficient is
(-10). This means that when
(x) increases by 1, the value of
(y) decreases by 10. Hence, 10 represents the decrease per step. The initial value is 85 because
(y=85) when
(x=0). Exam tip: In a linear rule
(y=a+bx),
(b) gives the rate of change; a negative
(b) indicates a decrease.
Frequently asked questions
What is the correct answer to this question?
Decrease of 10 per step
Why is this the correct answer?
In
(y=85-10x), the coefficient is
(-10). This means that when
(x) increases by 1, the value of
(y) decreases by 10. Hence, 10 represents the decrease per step. The initial value is 85 because
(y=85) when
(x=0). Exam tip: In a linear rule
(y=a+bx),
(b) gives the rate of change; a negative
(b) indicates a decrease.
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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