I have this image of a heart:
and this image of a back arrow:
I would like to modify the line width of the back arrow to match the line width of the heart. Any ideas on how I can accomplish this in illustrator?
If the artwork was just a stroked path, @Scott would be right. But from what I can see when I look at the SVG files, they are filled shapes:
See the nodes in the corners?
So you will need to Offset the path by a negative amount:
Object -> Path -> Offset Path
To end up with a thin arrow
Or, just scale down the arrow until it has the appearance of line thickness that you like, but it won't be at the original size anymore.