Question 209530
2sqrtx/c=y
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cross  multiply
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2sqrtx = cy,,,,,,,divide  by 2
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sqrtx = cy/2,,,, square  both  sides 
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x= c^2y^2/4
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check,,,{2 sqrt c^2 y^2/4}/c = y
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2(cy/2c)=y,,,,,ok
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