Solve x + 3y = 9

3x - 3y = - 13

x = - 1

y = 3.33

Step-by-step explanation:

Isolate one term from either equation.

W'ell isolate x from the first equation.

x + 3y = 9

Rearrange:

x = 9 - 3y

Substitute this value for x into the second equation.

3x - 3y = - 13

3 (9 - 3y) - 3y = - 13

27 - 9y - 3y = - 13

-12y = - 40

y = 10/3 = 3.33

Substitute this value for y into the original equation.

x + 3 * (3.33) = 9

x = - 1

Substitute both values into second equation to check.

3 (-1) - 3 (3.33) = - 13

Therefore, x = - 1

and y = 3.33 (or 10/3)

The answer is X = - 1 and Y = 3.33