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Y Intercept of a Straight Line. Y Axis. The line on a graph that runs vertically (up-down) through zero. It is used as a reference line so you can measure from it. The Y intercept of a straight line is simply where the line crosses the Y axis. Example:.
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Y Axis • The line on a graph that runs vertically (up-down) through zero. • It is used as a reference line so you can measure from it.
The Y intercept of a straight line is simply where the line crosses the Y axis.
In the above diagram the line crosses the Y axis at 1. • So the Y intercept is equal to 1.