2y + x = - 15, x=3y substitution method

x = - 9, y = - 3.

As an ordered pair it is (-9, - 3).

Step-by-step explanation:

Substitute x = 3y in equation 1:

2y + 3y = - 15

5y = - 15

y = - 15/5

y = - 3.

Now find x by plugging y = - 3 in x = 3y:

x = 3*-3 = - 9.

Check the answer in equation 1:

2 (-3) + - 9

= - 6 - 9

= - 15 Correct.