Project #5655 - systems of linear equations and inequalities

I need a step by step answer.  Please write the final answer in the correct form.

 

1)  Solve by substitution:

      x - y = 3

      2x + y = -4

 

 

 

17)  Purchasing:  A clothing manufacturer purchased 60 yd of cotton and 90 yd of wool for a total     cost of $1800.  Another purchase, at the same prices, included 80 yd of cotton and 20 yd of wool for a total cost of $1000.  Find the cost per yard of the cotton and the wool.

Subject Mathematics
Due By (Pacific Time) 05/05/2013 06:54 pm
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