Respuesta :

Answer:

x = -3

y = -3

Step-by-step explanation:

4x - y = -9 -------eqn 1

3x - 3y = 0 ---------eqn 2

From eqn 1, make y the subject of the formula

4x - y = -9

4x + 9 = y

y = 4x + 9

Substitute y into the eqn 2

3x - 3y = 0

3x - 3(4x + 9) = 0

3x - 12x - 27 = 0

-9x - 27 = 0

-27 = 9x

-27/9 = 9x/9

-3 = x

x = -3

Substitute x into the eqn 1

4x - y = -9

4(-3) - y = -9

-12 - y = -9

-12 + 9 = y

y = -3

The values are

x = -3

y = -3

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