(Answered) 1 solve the following system of 4 equations with 4 unknowns

Economics

1. Solve the following system of 4 equations with 4 unknowns by hand.

x1 + x3 = 25 x2 + x3 = 18 x1 + x2 = 23 x3 + x4 = 15

2. Write the system in the previous problem in matrix form and solve it.

Courses

	1	2	3
1	82	95	80
2	89	92	97
Students 3	65	68	60
4	75	79	64
5	85	72	70

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