limits 3

Question 1

how are uncertainties shown on a graph

Answer 1

as an error bar

Question 2

how do you calculate the percentage uncertainty in a gradient

Answer 2

draw the best lune of fit passing as close to all points as possible

draw the worst line of fit starting at the bottom of the first uncertainty and ending at the top of the last uncertainty

=best m - worst m / best m x100
or

= best y intercept - worst y intercept / best y intercept x 100