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In the linear relation \(y=-3x+7\), which statement is correct when \(x\) increases by 1 unit?

Answer and explanation

Correct answer: \(y\) decreases by 3 units

The coefficient of \(x\) is the slope, and here it is \(-3\). For \(\Delta x=1\), \(\Delta y=-3\times1=-3\), so \(y\) decreases by 3 units. The 7 is only the initial value. Exam tip: a negative slope indicates decay.

Related tags

Linear Growth And DecayLinear RelationSlopeNegative CoefficientPolynomialsClass 9 MathematicsIntroduction To PolynomialsMathematics

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