### Home > A2C > Chapter 7 > Lesson 7.2.4 > Problem 7-143

7-143.

Write a rule for a machine that will undo Kirsta's machine. Call it *c*(*x*). Homework Help ✎

Substitute *y* for *k*(*x*).

Find the inverse by switching the *x* and the *y*.

Then solve for *y*.