Question

Consider the following system of equations. 4x + ay = −1 4x + by + z...

Consider the following system of equations.
4x + ay = −1
4x + by + z = −1
2x + cy + 5z = 0

And let

A =
4 a 0
4 b 1
2 c 5

Suppose that det(A) = 5. Use Cramer's rule to solve the above system for the variable y.
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