I am trying to make a trend line that crosses the origin (0,0)

I am in a Chemistry class and we are doing a density lab. For this, we have to make a trendline, along with an equation. Now I want the trendline to cross the origin because with density, you do have the point that zero mass has a zero density. We were told by our teacher that our equation should cross at the point (0,0). Also, I tried making a point (0,0) in my table, but it still left me with a y-intercept for the best fit line (it had a b, in the y=mx+b)
How can I make the trendline intersect the origin and make the equation without a y-intercept. PLEASE HELP

Use the LINEST function:
LINES (known-y-values, known-x-values, nonzero-y-intercept, more-stats)
nonzero-y-intercept: 
An optional value specifying how the y intercept (constant b) should be calculated.
normal (1, TRUE, or omitted):  The value of the y intercept (constant b) should be calculated normally.
force 0 value (0, FALSE):  The value of the y intercept (constant b) should be forced to be 0.
Details in the iWork Formulas and Functions User Guide, which may be downloaded via the Help menu in Numbers '09.
You will need a column on your table to hold the calculated values if you want to show the line on your graph.
Regards,
Barry

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