(i)
I=income
x,y (variable)
Px is the price of deodorant
Py is the price of mouthwash
I=Px×X+Py×Y
I=900
Px=3
Py=2
9000=3x+2y
(ii) The budget constraint slope is negative as consumer must give up some of one good to obtain more of the other good
(iii) 9000=3x+4y
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