Respuesta :

musiclover10045

Each X and Y in the equations don't have a number in front of them so they are all considered 1.

D = 1*(-1) - 1*(-1) = -1 -1 = -2

The answer is -2

wegnerkolmp2741o

Answer:

-2

Step-by-step explanation:

We need to set up the matrix to find the determinant

a  b

c  d

To find the determinant we take ad - bc

x + y = 8

x - y = 10

Take the coefficients of the x and y terms

1  1

1 -1

1 (-1) - (1) *1

-1 - 1

-2

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