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2/5 = 8/20        3/4 = 15/20

8/20 + 15/20 = 23/20

23/20 = 1 and 3/20

I don't know how effectively I can communicate this answer via text without the whiteboard but I'll try.

i) First implicitly differentiate with respect to x: 2x + 2y * dy/dx = 0.

Rearranging...