The expression \(3x + 5x\) simplifies to **8x**. When you add the coefficients (3 and 5) of the variables with the same term (both have the variable \(x\)), you get 8. Therefore, the simplified expression is \(8x\).
Adding with variables is basically just addition, except you just match the numbers. So, 3x+5x+9y=8x+9y, because 3x and 5x don't have the same variable.
