# Write an expression for the length of an open polyline ABCD, if AB = y m, BC is 7.35 cm

Write an expression for the length of an open polyline ABCD, if AB = y m, BC is 7.35 cm less than AB, and CD is 5.12 dm greater than AB, and simplify it.

Let’s solve this task by actions and explain each of the actions:
1) AB – 7.35 = y -7.35 centimeters – the length of the BC link of the broken ABCD, since BC is 7.35 centimeters less than AB;
2) AB + 5.12 = y + 5.12 centimeters – the length of the link BD of the broken line ABCD, since CD is 5.12 centimeters less than AB;
3) y + y -7.35 + y + 5.12 = y + y + y – 2.23 centimeters – the length of the broken line ABCD.
Answer: the length of this broken line y + y + y is 2.23 centimeters.

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