A chef bought $17.01 worth of ribs and chicken. Ribs cost 1.89 per pound and chicken costs 0.90 per pound. The equation

Question

A chef bought $17.01 worth of ribs and chicken. Ribs cost 1.89 per pound and chicken costs 0.90 per pound. The equation 0.9c+1.89r = 17.01 represents the relationship between the quantities in this situation. 
Show that each of the following equations is equivalent to 0.9c+1.89r = 17.01. Then, explain when it might be helpful to write the equation in these forms. 
a. c = 18.9 -2.1r 
b. r = -10/21 c+9

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