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A trend line.
To connect all nine dots using five straight lines, start by visualizing the dots arranged in a 3x3 grid. Begin at the bottom left dot, draw a line diagonally upwards to the top right dot, extend the line out past the grid, then draw a line horizontally left to the top left dot, down to the middle left dot, and finally draw a line diagonally down to the bottom right dot. This approach allows for all dots to be connected without lifting your pen.
When you have two points of a line, you can connect the dots.
a line graph is called a line graph because first of all it uses lines and second of all its on a graph they use those lines to connect the dots so if you dont what im talking about with dots thats a whole diffrent question so look it up yourself
A line of best fit emphasizes the overall trend shown by all the data taken as a whole whereas if you just "connect the dots", the lines could be all over the place.