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Ans 2:
Class : Class 9
let each pencil costs x. So 5 pencil costs 5x
Therefore 70-5x = y
or -5x= y-70
or 5x=70-y
or x= (70-y)/5
Ans 3:
Class : Class 9
let each pencil costs x. So 5 pencil costs 5x
Therefore 70-5x = y
or -5x= y-70
or 5x=70-y
or x= (70-y)/5
Ans 4:
Class : Class 9
let each pencil costs x. So 5 pencil costs 5x
Therefore 70-5x = y
or -5x= y-70
or 5x=70-y
or x= (70-y)/5