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This is. My question please reply quickly

This is. My question please reply quickly-example-1
User Avinash A
by
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1 Answer

14 votes
14 votes

Hi!

Perimeter is all of the side lengths added up, therefore:

3x + 12 + 3x + 12 + 3x + 12 = 12x - 6

Add like terms:

9x + 36 = 12x - 6

Add 6 to both sides:

9x + 42 = 12x

Subtract both sides by 9x:

42 = 3x

Divide both sides by 3:

14 = x

Plug this into the equation 3x + 12:

3(14) + 12

Multiply 3 and 14:

42 + 12

Add 42 and 12:

54

The side length is 54 cm.

User Enver Arslan
by
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