8. Is the line 'a' perpendicular to 'b'?

The line '\(a\)' passes through the points \((1, -3)\) and \((3, -15)\), and the line '\(b\)' passes through the points \((12, -1)\) and \((24, 1)\). Is the line '\(a\)' perpendicular to '\(b\)'?

 

The slope of line '\(a\)' \(=\)

 

The slope of line '\(b\)' \(=\)

 

The line '\(a\)' perpendicular to '\(b\)' :