To solve this system of equations using substitution, what could be substituted in place of y in the first equation? 4x= 5 - 2y
y-2x = 7
O A. 7 - 21
O B. 4x-5
O C. 5-4c
————
2
O D. 2x + 7

Where the answer choices?

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