Because it is at the point where it crosses the y-axis, which is at value 0.
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The y-axis has the equation x=0, so every point on the y-axis has an x coordinate of zero.
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The x-intercept is where x is equal to zero, so look for a pair where x is zero, such as [0,7].
The y-intercept on the graph shows where the graph crosses the y-axis. The value is always the value of y at that point, because x is always equal to zero.
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