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10 cards from this deck
A straight line
Constant throughout (equals the gradient)
change in ychange in x\frac{\text{change in y}}{\text{change in x}}change in xchange in y
Rate of change
Right-angled triangle technique
Anywhere on line (gradient is constant)
(y-axis units)(x-axis units)\frac{\text{(y-axis units)}}{\text{(x-axis units)}}(x-axis units)(y-axis units)
AU min−1\text{AU min}^{-1}AU min−1
Y-variable decreases as x-variable increases
Shows direction of change, not just magnitude
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