Best-fit line is used in a graph with a whole bunch of dots. If the dots are grouped up and that they are all going in a direction if there is one then there should be a best-fit line which is only a line going down there path to point that it's not changing.
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the best fir definition for math is probably "Math is the reason for just about everything in life" Another one (which I thought was a little funny) was "Math is the reason you can play Video Games and watch T.V"
The Vertical Line Test for Functions: If any vertical line intercepts a graph in more than one point, the graph does not define y as a function of x. By the definition of a function, for each value of x we can have at most one value for y.
joined sets in math
The Vertical Line Test for Functions: If any vertical line intercepts a graph in more than one point, the graph does not define y as a function of x. By the definition of a function, for each value of x we can have at most one value for y.
By simply dividing and multipying orbs
A ray in math is a part of a line that has one end point