00:01
Suppose of the regression line for a set of data, y hat, equals 7x plus b, passes through the point negative 2, 4.
00:10
If x bar and y bar are the sample means of the x values and y values, respectively, then y hat equals, so you know it passes through, well, we already wrote negative 2, negative 4.
00:21
So we can just plug in the values here.
00:24
First, we can just solve for it just that way we can isolate the b, but we plug in negative 7 comma negative 2.
00:31
And then that will be equal to 4 plus b.
00:35
So this will be 14.
00:36
4 equals 14 plus b.
00:40
That means b will equal negative 10...