the lengths of the sides of a triangle are y, y+ 1, and 7 centimeters. if the perimeter is 56 centimeters, what is the value of y?

Question

the lengths of the sides of a triangle are y, y+ 1, and 7 centimeters.  if the perimeter is 56 centimeters, what is the value of y?

anonymous · Answer

Well, the perimeter of a triangle is the sum of all three sides.  We know that this will be 56 cm.  

We need to set up an equation to reflect the problem:

Side 1 + S2 + S3 = P(erimeter)

Inserting the given data:  (y)+(y+1)+7=56

Add like terms:

y + y = 2y
1 + 7 = 8

So, we have 2y + 8 = 56

Can you solve it from there?  If not, let me know.