<PRE><B>Question 829224</B>
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x + y + z = 207
y = 8x
z = x - 3
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put the system of linear equations into standard form:
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x + y + z = 207
8x - y = 0
x - z = 3
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copy and paste the above linear system in standard form into this matrix-method solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 21
y = 168
z = 18
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system matrix
1 1 1
8 -1 0
1 0 -1
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inverse of system matrix
0.1 0.1 0.1
0.8 -0.2 0.8
0.1 0.1 -0.9
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determinant of system matrix = 10
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Solve and graph linear equations:
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
https://sooeet.com/math/system-of-linear-equations-solver.php</PRE>