Struggling to calculate weights

Hi I am new to statistics and have been reading this website on simple Logistic regression
Simple Logistic Regression

What I am struggling with is how it obtain the intercept and slope values which are -17.2086 and 0.5934

According to the site to calculate this is a simple weighted linear regression of the observed log odds on the independent variable X.
But I do not know how to calculate this

Here is the data

X	Instances of Y	0	Total	Y as	Y as	Y as
	Coded as	0	ii+iii	Observed	Odds	Log Odds
28	4	2	6	0.3333	0.5	-0.6931
29	3	2	5	0.4	0.6667	-0.4055
30	2	7	9	0.7778	3.5	12528
31	2	7	9	0.7778	3.5	12528
32	4	16	20	0.8	4	1.3863
33	1	14	15	0.9333	14	2.6391

I am doing this by hand (well excel) and what I have been told so far it is multiplying the the number of each date points by its weight But I am struggling to do that.

Any help would be great.