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14a. x=3, y=-1

14b. 12

14c. 40

Step-by-step explanation:

Opposite sides have to be equal, so you can write the following equations:

4 x + 2 y = x - 3 y + 4

2 x + 2 y = x - y

Simplify both:

3x + 5y = 4

x = - 3y

Plug the second into the first:

-9y + 5y = 4

-4y = 4

y = -1

so

x = -3*-1 = 3

The perimeter is a matter of filling in x and y in the formulas:

10 + 4 + 10 + 4 = 32

Now that we know the side lengths 4 and 10, the area is their multiplication

4*10 = 40

26

step-by-step explanation: