Graphs (AQA A-Level Biology): Flashcards

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Calculating the Rate of Change for a Linear Relationship
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How does a linear relationship appear on a graph?

A straight line

Rate of change in a linear relationship

Constant throughout (equals the gradient)

Formula for gradient

change in ychange in x\frac{\text{change in y}}{\text{change in x}}

What gradient represents in a linear relationship

Rate of change

Method for calculating gradient from a graph

Right-angled triangle technique

Where can you place the triangle for gradient calculation?

Anywhere on line (gradient is constant)

Units formula for rate of change

(y-axis units)(x-axis units)\frac{\text{(y-axis units)}}{\text{(x-axis units)}}

Units for concentration (AU) over time (min)

AU min−1\text{AU min}^{-1}

Meaning of a negative gradient

Y-variable decreases as x-variable increases

Importance of negative sign in gradient

Shows direction of change, not just magnitude

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Arithmetic & Numerical Computation

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Geometry & Trigonometry

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