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@mathstudent55 okay so do i plug in 3x iinto the equation

yes, you can substitute 3x into the 2nd equation to solve for x

Since y = 3x, plug that in for y of the other equation:
3x + 12 = 6x

okay and do i combin like terms 3x and 6x

That will give you x, then plug the value of x into y = 3x, and you'll get y.

i have 4x

so y is 12 right

@mathstudent55 y is 12

3x + 12 = 6x
12 = 3x
x = 4
y = 3x
y = 3(4)
y = 12