explain why the following statement are false explain your answers using calculation or appropriate diagrams wherever necessary. each question is for 2 marks only

a) a normal good is a good for which the demand increases as income decreases holding everything else constant.

b) if the price of peaches, a substitute for plums, decreases, the demand for plums will increase.

c) the quantity demanded of women's shoes in Big W increases by 10% when household income declined by 20% .big W shoes are considered as normal goods.

d) an increase in wages will cause the supply curve for a product to shift to the right

PLEASE USE APPROPRIATE DIAGRAMS AND FORMULAS AS WELL I NEED A STEP BY STEP SOLUTION