It is a line that passes through or nearly passes through the plotted points on the coordinated grid.
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A straight line equation
Jeremy surveyed students in his class about their spending habits in the school cafeteria. He used the data to create a scatterplot. How Students Spend Money in the Cafeteria Which is the equation of his trend line?
36 one-meter squares will fit into 36 square meters
It is called the line of best fit because it tends to satisfy all the possible points in consideration at the same time with minimal variation.
The largest square that could fit in a circle of diameter 10 inches has dimensions 5sqrt(2) inches by 5sqrt(2) inches.