Question

The side of an equilateral triangle are 2x - 3y+1 , x + y -1 and 3x - y -9. Find the perimeter.

Answer 1

Answer:

Step-by-step explanation:

perimeter of a triangle = sum of its sides

equilateral triangle has all sides equal.

perimeter = (2x-3y+1) + (x+y -1 ) + (3x - y - 9)

                =2x +x+3x -3y +y - y +1-1-9

               =6x-3y-9

Answer 2

Step-by-step explanation:

2x-3y+1=x+y-1

x-4y=-2

x+2=4y

(x+2)/4=y

3x-y-9=x+y-1

3x-9=x+2y-1

3x-9+1=x+(2x+4)/4

3x-9+1=(4x+2x+4)/4

12x-36+4=4x+2x+4

8x-32=2x+4

8x-2x=4+32

6x = 36

x=6

y = 8/4= 2

1st side : 2x-3y+1= 7

2nd side : x+y-1= 7

3rd side : 3x-y-9= 7

Perimeter of the triangle = 7*3 = 21.