Where, y=0.
Key Idea: X-Intercept
The x-intercept is the point where a graph crosses the x-axis.
At this point, the y-value is 0.
General Rule:
To find the x-intercept, set y=0 in the equation and solve for .
The result gives the x-coordinate of the intercept.
Written as a point: (x,0).
Why this matters for the SAT:
X-intercepts are key in graphing, factoring, and quadratic problems.
They often represent solutions or zeros of an equation.
Where, x=0.
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 .
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.
