00:01
Okay, every straight line i can write in the form of y equals mx plus b, or m is the slope and b is the y intercept.
00:13
So first step, let's find m.
00:15
For the slope, m is y2 minus y1 over x2 minus x1.
00:25
The slope formula.
00:27
And that will be 5 minus minus 4 over minus 4 minus 1.
00:35
So here, for example, is y2 and here is y1.
00:41
Here is x2 and here is x1.
00:48
So we get here then 5 plus 4, so it's 9, minus 4 minus 1, negative 5.
00:56
So my slope is minus 9 over 5.
01:01
So y equals minus 9 over 5 times x plus b.
01:08
And to find b, just plug in either point...