The third side of the triangle will be 3x + 5y.
The perimeter is defined as the sum of all the sides of the given shapes. for the triangle, the perimeter will be the sum of all three sides of the triangle. A triangle is a shape in a two-dimensional plane enclosed by three sides.
Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.
The third side will be calculated as below:-
Perimeter = Sum of all the sides
(9x+7y) = (2x+3y) + (4x-y) + Third side
Third side = (9x+7y) - (2x+3y) - (4x-y)
Third side = (9-2-4)x + (7-3 - -1)y
Third side = 3x + (4 - - 1)y
Third side = 3x + (4 + 1)y
Third side = 3x + 5y
Therefore, the third side of the triangle will be 3x + 5y.
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