b) \( 2 b x-3 a y-6 b y+a x= \)

To solve the expression \( 2 b x - 3 a y - 6 b y + a x \), you can start by rearranging and grouping the terms by variables. Combine like terms to simplify it: Group \(x\) terms together: \( (2b + a)x \) and group \(y\) terms together: \( (-3a - 6b)y \). So the final simplified expression becomes \( (2b + a)x + (-3a - 6b)y \). This method not only simplifies your work but can also help you spot patterns or factoring opportunities! When tackling expressions like this, watch out for signs and remembering to combine only like terms. A common mistake is omitting coefficients when combining, which can lead to completely different answers. Always double-check your grouping!