00:01
We're being asked to write the equation of a line in slope intercept form for a line that has a slope of negative 3 and passes through the point 3 negative 1.
00:08
Well, we can't go straight to slope intercept form because although we have the slope, we don't have the y intercept.
00:13
So we can use point slope form to do this.
00:16
Well, remember, point slope form is y minus y sub 1 equals m times the quantity of x minus x sub 1.
00:22
Well, m is our slope, which we have, and x sub 1 and y sub 1 represents a point on our line, which we also have.
00:30
So let's substitute these values into our equation.
00:33
So we're going to have y minus y sub 1, which is negative 1, equals m, which is negative 3, times the quantity of x minus x sub 1, which is positive 3...