how to prolong best fit line to reach to x-axis ?

I draw a best fit line

but I want to prolong it to x-axis, how to do this ?

I use this code:

 figure;
h=bar(val,n,'b');
axis([-5 25 0 95]);
grid on
hold on
A=[1;17];   
B=[16;92];
plot(A, B, 'go')%, 'LineWidth', 1, 'MarkerSize', 10);
coeffs = polyfit(A, B, 1);
fittedX = linspace(min(A), max(A), 200);
fittedY = polyval(coeffs, fittedX);
plot(fittedX, fittedY, 'r-', 'LineWidth', 3);

how to prolong the best fit line ?

Answer 1

[Star Strider]

Change the linspace call to:

fittedX = linspace(-coeffs(2)/coeffs(1), max(A), 200);

[Amr Hashem]

Thanks

[Star Strider]

My pleasure!