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I'm trying to make a graph to compare between 3 value progressions via equations. Is this possible or should I seek out other software? If so, what one would you recommend?

Hi,

Completely new to FreeOffice and graph creation in general. I'm struggling in creating a graph that allows me to compare 3 different progressions through the use of equations. Is this possible at all or am I going about my goal in the entirely wrong way?