Solve the system by substitution.
-Y = x
-7x – 5y = –20

On a piece of paper, graph . then determine which answer choice matches the graph you drew

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.

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did