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Question 829699: One positive number is 3 times another. The sum of two numbers is 720. What's the equation?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! ---
x = 3y
x + y = 720
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put the system of linear equations into standard form:
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x - 3y = 0
x + y = 720
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copy and paste the above linear system in standard form into this matrix-method solver:
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solution:
x = 540
y = 180
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system matrix
1 -3
1 1
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inverse of system matrix
0.25 0.75
-0.25 0.25
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determinant of system matrix = 4
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