CPM Homework Help : PC Problem 12-55

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Step (a):

Steps (b):

In general,

Set up a system of equations and solve for y in terms of x.

Hint (c):

For parts (c), (d), and (e), follow the steps in part (b).

Step 1 (e):

Step 2 (e):

Solving for x in the top equation and y in the bottom equation:

Step 3 (e):

By substitution:

Step 4 (e):

x(k + 4)(k − 7) = −30x

Since we have assumed x ≠ 0, divide by x and solve for k.