ten pounds of potatoes cost $2.55. How much will 6 pounds cost? Write and solve a proportion. Justify your steps.

Answer 1

6/10=x/2.55

multiply each side by 2.55

6/10 x 2.55=x

Answer 2

8 = 2x – 3 This is the equation to be solved.
8+3 = 2x – 3+3 Add each side by 3.
11 = 2x
11/( 2 ) = 2x/2 Next divide each side 2.

5 1/2=x Answer = 5 1/2