The first equation is solved for x.
We can use the substitution method and substitute for x in the second equation.
x = 3y
3x - 5y = 12
3(3y) - 5y = 12
9y - 5y = 12
4y = 12
y = 3
Now that we know y, we substitute in the first original equation to find x.
x = 3y
x = 3(3)
x = 9
Answer: x = 9 and y = 3