The price of a sweater is $5 less than twice the price of a shirt. if four sweaters and three shirts cost $200, find the price of each shirt and sweater

Sw+5=2sh 
4sw+3sh=200 
4(2sh-5)+3sh=200 

$20, $35 The shirts are $20 and the sweaters are $35

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm