<PRE><B>Question 828321</B>
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(x + y + z)/3 = 15
z = x + 5
y = x - 4
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put the system of linear equations into standard form:
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x + y + z = 45
x - z = -5
x - y = 4
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solution:
x = 14.666667 = 14 + 2/3
y = 10.666667 = 10 + 2/3
z = 19.666667 = 19 + 2/3
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system matrix
1 1 1
1 0 -1
1 -1 0
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inverse of system matrix
0.33333333 0.33333333 0.33333333
0.33333333 0.33333333 -0.66666667
0.33333333 -0.66666667 0.33333333
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determinant of system matrix = -3
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Solve quadratic equations, quadratic formula:
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Solve systems of linear equations up to 6-equations 6-variables:
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