The Linear Combination node, given n Input connectors, each one with a load assigned, it computes the linear combination and sends the result to the Output connector.

$$C = \sum_{i=1}^n {input_i load_i} = input_1 load_1 + input_2 load_2 + ... + input_n load_n $$

The load value is set through the Load property of each Input connector.