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1. If x varies as y then x2 + y2 varies as
x = y
Or, x - y = 0
Or, (x - y)2 = 0
Or, x2 + y2 - 2xy = 0
Or, x2 + y2 = 2xy
It means that, x2 + y2 varies as xy
Solution:
Given,x = y
Or, x - y = 0
Or, (x - y)2 = 0
Or, x2 + y2 - 2xy = 0
Or, x2 + y2 = 2xy
It means that, x2 + y2 varies as xy