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Solving an Equation using a Substitution

The formula D^2 = 4050 / i indicates the amount of illumination (i) , in foot-candles, produced by a light source relative to the distance (d) from the source. How far from the source is the illumination equal to 50 foot-candles?

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Substitute i = 50 into your equation this gives D^2 = 4050/50 or ...

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An equation is solved using a substitution. The solution is detailed and well presented. The response received a rating of "5" from the student who originally posted the question.