### Home > A2C > Chapter 1 > Lesson 1.1.1 > Problem 1-5

1-5.

Angelica is working with function machines. She has the two machines *.* She wants to put them in order so that the output of the first machine becomes the input of the second. She wants to use a beginning input of

In what order must she put the machines to get a final output of 5?

Try substituting

for inand then input the result into. If that does not work, switch the order.Substitute

for each .Simplify.

Substitute the output of the first function for

in the second function.The output needs to be

. Is it possible for her to get a final output of -5? If so, show how she could do that. If not, explain why not.

See above (original incorrect solution).