Solve the following system of equations.

x + 2y − 6 = z
3y − 2z = 7
4 + 3x = 2y − 5z

a.
b.
c. x = 0, y = 5, z = 4
d. x = 2, y = 1, z = 2

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.