Answer:
1 unit of X must be sacrifised to gain a unit of Y, with satisfying Budget Constraint .
Explanation:
Budget Line shows the product combinations that a consumer can buy with given prices & money income (spending all) . Equation : P1X1 + P2X2 = M
Price ratio slope of the budget line i.e = P1/P2 : shows the amount of a good needed to be sacrifised to gain a unit of the other good , given prices & income.
So, Price Ratio : PX / PY = 2 / 2 = 1 in this case; implies 1 unit of Good X is needed to be sacrifised to gain a unit of good Y with given prices & income.