Solve the system in Problem 16 by writing the system as a matrix equation and using the inverse of the coefficient matrix (see Problem 15). Also, solve the system if the constants 3 and 5 are replaced by 7 and 10, respectively. By 4 and 2, respectively.

Data from Problem 16

Solve the following system using elimination by addition:

4x₁ + 3x₂ = 3

3x₁ + 2x₂ = 5

Data from Problem 17

Solve the system in Problem 16 by performing appropriate row operations on the augmented matrix of the system.