What is the measure of the third side of a triangle below where P is the measure of the perimeter? 2x-3y x+2y p=5x+2y

Step-by-step explanation:

Given

Shape: Triangle

Sides: and

Required

The measure of the third side

The perimeter of a triangle is the sum of all three sides;

Let the third side be represented by Side3

Hence;

Collect like terms

Collect like terms

Hence, the measure of the third side is 2x + 3y

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x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18