An equilateral triangle has a perimeter of 21 and a side length of 2x - 3. solve for x

In any triangle, Perimeter (P) = a + b + c, where, a, b and c are the sides  and P is the perimeter of the triangle

In case of equilateral triangle, the length of all sides are equal. Therefore,

P = a + a + a = 3a

Here, a = (2x - 3) and P = 21

or, 21 = 3 (2x - 3)

or, 7 = 2x - 3

or, 2x = 10

or, x = 5

(3x-8) or (3x+8)

step-by-step explanation:

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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