DECLARE	@Data TABLE
	(
		mySet TINYINT NOT NULL,
		x DECIMAL(38, 10),
		y DECIMAL(38, 10)
	) 

INSERT	@Data
SELECT	1, 40.5 , 104.5  UNION ALL
SELECT	1, 38.6 , 102    UNION ALL
SELECT	1, 37.9 , 100    UNION ALL
SELECT	1, 36.2 ,  97.5  UNION ALL
SELECT	1, 35.1 ,  95.5  UNION ALL
SELECT	1, 34.6 ,  94    UNION ALL
SELECT	2,   .72,   2.16 UNION ALL
SELECT	2,  1.31,   1.61 UNION ALL
SELECT	2,  1.95,   1.16 UNION ALL
SELECT	2,  2.58,    .85 UNION ALL
SELECT	2,  3.14,    .5  UNION ALL
SELECT	3,  3   ,   1.5  UNION ALL
SELECT	3,  4   ,   9.3  UNION ALL
SELECT	3,  6   ,  23.4  UNION ALL
SELECT	3, 10   ,  45.8  UNION ALL
SELECT	3, 12   ,  60.1  UNION ALL
SELECT	4, 10   ,    .95 UNION ALL
SELECT	4, 12   ,   1.05 UNION ALL
SELECT	4, 15   ,   1.25 UNION ALL
SELECT	4, 17   ,   1.41 UNION ALL
SELECT	4, 20   ,   1.73 UNION ALL
SELECT	4, 22   ,   2    UNION ALL
SELECT	4, 25   ,   2.53 UNION ALL
SELECT	4, 27   ,   2.98 UNION ALL
SELECT	4, 30   ,   3.85 UNION ALL
SELECT	4, 32   ,   4.59 UNION ALL
SELECT	4, 35   ,   6.02

SELECT		mySet,
		dbo.Linear(x, y) AS Info
FROM		@Data
GROUP BY	mySet
ORDER BY	mySet