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how do you identify the x and y intercepts from a graph?

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The X-intercept is where the line you draw crosses the X-axis (the horizontal line).  The Y-intercept is where the line you draw crosses the Y-axis (the vertical line).  Remember, the center point of the grid is "0".  On the X axis, numbers to the right of the zero are positive, and to the left they are negative.  On the Y axis, numbers above the 0 are positive, and below the zero are negative.  
Do you also need to know how to write the equation in standard form, or do you have that covered already?