In order to protect students' eyesight, the height of desks is designed according to a certain proportion: if the height of desks is Y㎝ and the height of chairs is X㎝ (including backrest), then there should be a relationship between X and Y = KX+B, and the heights of two sets of desks that meet the requirements are listed below. The first set: the chair is 40㎝ high and the table is 75cm； high; The second set, the chair is 37㎝ high and the table is 70.2㎝ high.

(1) Try to determine the relationship between Y and X;

(2) When the height of the chair is 43 ",what is the height of the table?