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In the line \(y=-\frac{3}{4}x+6\), how much will (y) decrease when (x) increases by (8)?

Answer and explanation

Correct answer: 6

The slope is \(-\frac{3}{4}\), meaning that for every increase of 4 units in \(x\), \(y\) decreases by 3 units. An increase of 8 in \(x\) is two such increases, so \(y\) decreases by \(2\times3=6\). Option 3 would apply only when \(x\) increases by 4. Exam tip: use \(\Delta y=m\Delta x\); a negative change in \(y\) indicates a decrease.

Related tags

Linear EquationsSlopeNegative SlopeChange In YCoordinate GeometrySlope And Y InterceptIntroduction To PolynomialsMathematics

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