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12 cards from this deck
How steep a line is
Steeper
Change in yChange in x\frac{\text{Change in y}}{\text{Change in x}}Change in xChange in y
Four steps
Two accurate points on the line
Subtract in same order for both x and y
Check the sign is correct
Positive
Negative
Grid intersections with whole numbers
Wrong sign for gradient
Step 4: checking the sign
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