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12-55.
In general,
Set up a system of equations and solve for y in terms of x.
For parts (c), (d), and (e), follow the steps in part (b).
Solving for x in the top equation and y in the bottom equation:
By substitution:
x(k + 4)(k − 7) = −30x
Since we have assumed x ≠ 0, divide by x and solve for k.