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10 cards from this deck
y = ax + b, where a is the gradient and b is y-intercept.
Gradient = height ÷ base using two points on the line.
Gradient = (9-3) ÷ (5-2) = 6 ÷ 3 = 2.
A positive gradient indicates a positive correlation.
Use b = y - ax with a point on the line.
b = 10 - (1.5 * 4) = 10 - 6 = 4.
For each unit increase in x, y increases by 3.
It ensures accurate gradient calculations, avoiding errors.
y = 2x + 5.
A negative gradient indicates a negative correlation.
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