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Question

Solve this system using matrices.
3.7x - 2.3y + 4.2z = 8
2.6x + 4.6y - 3.9z = 10
8x + 2z = 20
17 years ago

Answers

Reiny
Doing this question by matrices seems inefficient and leads to some "nasty" arithmetic if done by hand

Why don't you take the last equation, which reduces to
z = 10 - 4x
and substitute that into the first two equations.
The resulting 2 equations in 2 unknowns does not appear too bad.
17 years ago

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