Solve the following system:
{y = 3 x
y = x-4
Substitute y = 3 x into the second equation:
{y = 3 x
3 x = x-4
In the second equation, look to solve for x:
{y = 3 x
3 x = x-4
Subtract x from both sides:
{y = 3 x
2 x = -4
Divide both sides by 2:
{y = 3 x
x = -2
Substitute x = -2 into the first equation:
{y = -6
x = -2
Collect results in alphabetical order:
Answer: | x = -2 y = -6
