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Mathematical difference method of grade two in junior high school
Scheme 1- Scheme 2 = (4x+8y)-(3x+9y) = x-y.

When x > y, there must be x-y > 0. Option 2 is more economical than option 1.

When x = y, there must be x-y = 0; Scheme 1 is the same as scheme 2.

When x < y, there must be x-y < 0;; Scheme 1 is more economical than scheme 2.