Question 826268: [ If Jason were 57 less than 6 times his present age, he would be 3 times as old as he was 4 years ago. how old is he? ] Answer by TimothyLamb(4379) (Show Source):
You can put this solution on YOUR website! ---
x = Jason's age now
y = Jason's age (hypothetical)
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y = 6x - 57
y = 3(x - 4)
y = 3x - 12
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put the system of linear equations into standard form:
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6x - y = 57
3x - y = 12
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solution:
x = Jason's age now = 15
y = Jason's age (hypothetical) = 33
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system matrix
6 -1
3 -1
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inverse of system matrix
0.33333333 -0.33333333
1 -2
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determinant of system matrix = -3
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