For Exercises 1-4, solve the system of equations using
a. The substitution method or the addition method (see Sections 8.1 and 8.2).
b. Gaussian elimination (see Section 9.1).
c. Gauss-Jordan elimination (see Section 9.1).
d. The inverse of the coefficient matrix (see Section 9.4).
e. Cramer's rule (see Section 9.5).
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