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To find the y-intercept from a graph - look at where the graph of the line intersects the y-axis. The point at where the graph of the line crosses the y-axis will be the y-intercept with the coordinates of (0,y) The point at which the line cuts the y – axis is called as y – intercept.
You can locate the point by seeing the graph.

Note:

If you are given a linear equation say ax + by + c = 0

Now if we plug x = 0 in the given equation we will get the y – intercept.

y = -c/b

If the given equation is of the form y = mx + b

b is the y – intercept of the line. Source: www.icoachmath.com

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