Answer:
Increase in Demand , Increase in Equilibrium Price & Equilibrium Quantity
Explanation:
Demand i.e buyers ability & willingness to buy, has a factor affecting : 'Price of Other Goods - Substitute Goods', which can be inter changeably used. Substitute goods' price & quantity are directly related because- rise in price of a good makes other good relatively cheaper & increases latter's demand and vice versa.
Similarly, If X & Y are substitutes - Increase in price of Y makes it relatively expensive, reduces its demand & increases X demand by making it relatively cheaper (shifts demand curve rightwards).
Increase in X demand & rightward shift in demand curve creates Excess Demand, causing competition among buyers & increasing EquilIbrium Price & equilibrium quantity at new equilibrium.