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Wildly inaccurate trendline equations

I'm trying to add trendlines to my line graph, and then use the equations to do further calculations, but the trendline equation is completely off. Equation should be y=-1.37x+102, but excel is giving me y=-27.433x+129.83

All I did was right-click, add trendline, add equations and r squared

https://preview.redd.it/7bozdbobg1kg1.png?width=1180&format=png&auto=webp&s=3555dd0327279781652b37abd6d2fdcc11ad4484

submitted by /u/mk495
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