Three sides

Side b is 2 cm longer than side c, side a is 9 cm shorter than side b. The triangle circumference is 40 cm. Find the length of sides a, b, c . .. .

Correct answer:

a =  8
b =  17
c =  15

Step-by-step explanation:

b = 2+c
a = b-9
a+b+c = 40

b-c = 2
a-b = -9
a+b+c = 40

a = 8
b = 17
c = 15

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