Anumber is equal to the sum of half a second number and 3. the first number is also equal to the sum of one-quarter of the second number and 5. the situation can be represented by using the graph below, where x represents the second number. which equations represent the situation? y=1/2x+3 and y=1/4x+5 y=3x+1/2 and y=5x+1/4 y=2x+3 and y=4x+5 y=3x+2 and y=5x+4

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.