It is part of the equation that intercepts the y axis
For example the straight line equation: y = 2x+4 is in slope-intercept form and 4 is the y intercept and 2 is the slope.
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y=mx+b is the general slope intercept equation and b represents the y intercept.
If y = 7, then the y-intercept is 7.
The y-intercept of a linear equation is the point where the graph of the line represented by that equation crosses the y-axis.
In the straight line equation of y = 3x+5 the slope is 3 and the y intercept is 5
If it a straight line with no y intercept, it must be parallel to the y-axis. So the equation is x = 3