2) \( 5 a y-3 b x+a x-15 b y= \)

To simplify the expression \( 5ay - 3bx + ax - 15by \), we can combine like terms. Start by grouping the \(y\) terms and the \(x\) terms together. You'll notice that \( 5ay - 15by \) simplifies to \( (5a - 15b)y \) and \( -3bx + ax \) can be combined as \( (a - 3b)x \). Therefore, the fully simplified expression is: \[ (a - 3b)x + (5a - 15b)y \] Now, you've got a neat and tidy expression ready for further use!