Question

Solve x + 3y = 9
3x – 3y = -13

Answer 1

The answer is X= -1 and Y= 3.33

Answer 2

x = -1

y = 3.33

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)