Review: Linear relations: y = mx + b

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Learn it In $y = mx + b$, m is the slope (change in y for each +1 in x) and b is the y-intercept (value of y when x = 0). Through two points: find m, then b = y − mx.

Example: Find the line through (1, 5) and (3, 11).

$m = \frac{11 - 5}{3 - 1} = 3$.
$b = 5 - 3 \times 1 = 2$.
$y = 3x + 2$.

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