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01.08.2019 •
Mathematics
Solve using matrices. show your work. x+y=5 2x-y=1
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Ответ:
The coefficients for the problem in matrix form:
1 1 5
2 -1 1
Add -2(row 1) to row 2:
1 1 5
0 -3 -9
Add (1/3) row 2 to row 1
1 0 2
0 -3 -9
Divide Row 2 by -3
1 0 2
0 1 3
We now have an identity matrix inf the first two columns. Row 1 gives us the value of x, and row 2 gives us the value of y:
x = 2, y = 3
Ответ: