Get y coordinate for x = 0 from linear trendline

Hi. I have a scatter of three coordinates:

%scattered values (y1...4 are numbers between 0 & 1, x1...4 are numbers between 0 & 100)
yVect = [y1, y2, y3, y4];
xVect = [x1, x2, x3];

%scatter plot & trendline
plot = figure;
ST_533 = axes('Parent',plot);
hold(ST_533,'all');
scatter(xVect,yVect,'filled');
ylim([0 1]);
Poly = polyfit(xVect,yVect,1);
x = linspace(0,100,5000);
Trend = polyval(Poly,x);
hold on
plot(x,Trend);

Now I need to find the y-value at which the trendline passes through the y-axes (so when x equals zero). Any Idea how I can do this? I've been searching for quite a while and couldn't find anything so far. Thanks!

Answer 1

[Marc Jakobi]

I just figured it out. It won't work for all types of trend lines, but it solves my problem. Since x starts at zero, I can easily find it by typing

A = Trend(1);