Key Idea: Y-Intercept

The y-intercept is the point where a graph crosses the y-axis.
At this point, the x-value is 0.

General Rule:

• To find the y-intercept, set x=0 in the equation and solve for $y$.

• The result gives the y-coordinate of the intercept.

• Written as a point: (0,y).

Why this matters for the SAT:

Y-intercepts are useful for graphing linear and quadratic equations.
They help identify where the graph starts or crosses the vertical axis — a common SAT concept in algebra and functions.