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# physics as level unit 3 graphs general qn Watch

1. ok so when u plot points on the graph and then u draw a line of best fit how do we know if the line goes through the origin like for this graph how are we meant to know if it starts from origin or not (graph of t^2 against l)
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2. (Original post by pizzaqueenx)
ok so when u plot points on the graph and then u draw a line of best fit how do we know if the line goes through the origin like for this graph how are we meant to know if it starts from origin or not (graph of t^2 against l)
samb1234
3. Look at the relationship. T = 2pi root( l / g)
When you square it you get T2 = 4pi2 * l / g
Since you're plotting T2 against l, and 4pi2/g is a constant, this resembles y = mx. There is no +c (y intercept) as in y = mx + c.
So does a graph of y = mx go through the origin?

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