at home drug test kit question

[Burnt Toast]

mine came up one solid and the other line was slightly faded. does this mean i barley passed it?

No it does not. The 'T' line is often more faint than the 'C' line. Even synthetic urine controls can produce faint lines on an assay kit

or how does that work?

Simple. A line in both the 'C' region and the 'T' region is a negative. Intensity is a non-issue.