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I've graphed those values in Excel and then compared it to your image.
The graphs are the same, and my R2 value is closer to your friend's value.
Basically, your trendlines are different; the scatterplots are same.
You must have set the intercept to 0.0 along with checking off Display Equation and Display R-squared value. If your professor has required that you have the trendline cross the y-axis, then your graph is correct (and your lab partner has just forgotten to Set Intercept for her trendline)