Key Idea: Slope

The slope measures the steepness of a line on a coordinate plane.

General Rule:

• “Rise” is the vertical change (change in $y$).

• “Run” is the horizontal change (change in $x$).

• Positive slope → line goes up; negative slope → line goes down.

Why this matters for the SAT:

Slope is used in algebra, linear equations, and coordinate geometry.
It helps quickly identify line steepness, compare lines, and solve for equations of lines.