00:01
Okay, so confusingly on the y -axis we've got x, so up here our dependent variable is x in centimetres and our independent variable is time in seconds.
00:14
And we're told on the graph that the equation is that x is equal to 13 .2 plus 0 .6736t.
00:24
Now on that graph they've actually said y is equal to 13 .2 plus 0 .6736x, x, but they're just using the terminology that we usually call the axis that goes upwards y and the axis that goes across x.
00:35
But here those two variables are x and t instead.
00:39
So this is our equation.
00:42
So the first thing that we're asked is what is the slope? the slope is just the coefficient of the independent variable.
00:49
Our independent variable here is t, and so the coefficient of that in our equation is 0 .6736.
00:57
What is its unit? well, we know the unit of x is centimetres, so the units of all of these terms also have to be centimetres...