Question

Perimeter of a triangle is 21 cm. The sides are given by 3y+1, y+3, 5y-1. Find the length of each side.

Answer 1

Answer:

7cm

5cm

and 9cm

Step-by-step explanation:

perimeter of triangle = sum of its sides

21 = 3y+1+y+3+5y-1

21 = 9y+3

9y+3 = 21

9y = 21-3 = 18

y = 18/9

y = 2cm

then,

3y+1 = 3(2)+1

= 6+1

= 7cm

y+3. = 2+3

= 5cm

5y-1 = 5(2)-1

= 10-1

= 9cm

7cm+5cm+9cm= 21cm