because squares take up too much room
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When you have two points of a line, you can connect the dots.
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The dotted lines in the right side are for the length. This is to make the map easier to read.
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
In the same coordinate space, i.e. on the same set of axes: -- Graph the first equation. -- Graph the second equation. -- Graph the third equation. . . -- Rinse and repeat for each equation in the system. -- Visually examine the graphs to find the points (2-dimension graph) or lines (3-dimension graph) where all of the individual graphs intersect. Since those points or lines lie on the graph of each individual graph, they are the solution to the entire system of equations.