If two lines in the standard (x, y) coordinate plane are
perpendiuclar and the slope of one of the lines is -5/7, what is the slope of the other line?
A. 7/5
B. 5/7
C. -5/7
D. -7/5
E. -5

Abox of chocolates costs $7. which equation relates the number of boxes sold (x) and total cost of the boxes sold (y)?

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.

Use the elimination method to solve the systems of equations.choose the correct ordered pair. 7x+4y=39