Question

If the perimeter of a triangle is given by 3x - y + 6 and two of it sides are given by 4x - 9 and 12y - x + 8 , then find its third side.​

Answer 1

Answer:

-13y + 7

Step-by-step explanation:

Sum of two sides = 4x - 9 + 12y - x + 8 => 3x + 12y - 1

Perimeter = 3x - y + 6

Third side = Perimeter - Sum of two sides

=> 3x - y + 6 - (3x + 12y - 1)

=> 3x - y + 6 - 3x -12y + 1

=> -13y + 7

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