Question 1158869
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The y-intercept is where the line (or curve) crosses the y-axis.  Mathematically, if you have y = some_function_of_x  then it is the y value when you set x=0.


OPTIONAL:
For example, when dealing with straight lines, the equation of the line is often written y = mx + b   where m=slope (the rise/run or  (change in y) / (change in x)) and b is the y-intercept.   

Below is the graph of  y = 2x-5 in green.  Notice how the line meets the y-axis at -5:

{{{ graph(400,400, -10,10,-10,10, grid(1), y= 2x-5) }}}