Asked by JaneLee
Solve this system using matrices.
3.7x - 2.3y + 4.2z = 8
2.6x + 4.6y - 3.9z = 10
8x + 2z = 20
3.7x - 2.3y + 4.2z = 8
2.6x + 4.6y - 3.9z = 10
8x + 2z = 20
Answers
Answered by
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.
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.
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