Graphically, it is the point where the graph intersects the y-axis. It gives the value of the y-variable when the x-variable is 0. If, to take a simplistic example, x represented the number of units produced by a firm, and y was the total cost, then the y-intercept would represent the fixed costs - the amount the firm would have to pay even if it produced nothing - eg for land, rent etc.
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if you are looking at a graph the y intercept is when the graph crosses the y axis and the x intercept is when the graph crosses the x axis. if you have a formula... plug zero in for x to find the y intercept, and plug zero in for y to find the x intercept
Y = 2.5X ( + 0 ) So, zero is the Y intercept of this function.
The graph doesn't intersect either axis.
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The y-intercept of a linear equation is the point where the graph of the line represented by that equation crosses the y-axis.