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

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I draw a best fit line
but I want to prolong it to x-axis, how to do this ?
I use this code:
axis([-5 25 0 95]);
grid on
hold on
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 ?

Accepted Answer

Star Strider
Star Strider on 19 Oct 2015
Change the linspace call to:
fittedX = linspace(-coeffs(2)/coeffs(1), max(A), 200);

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