SOLUTION: 4 years ago my fathers age was 5 times my age.at present sum of our age is 50.what is fathers present age?sir kindly give me its step also?
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Question 830784: 4 years ago my fathers age was 5 times my age.at present sum of our age is 50.what is fathers present age?sir kindly give me its step also? Answer by TimothyLamb(4379) (Show Source):
You can put this solution on YOUR website! ---
x = father
y = son
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x - 4 = 5(y - 4)
x + y = 50
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put the system of linear equations into standard form:
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x - 4 = 5y - 20
x + y = 50
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x - 5y = -16
x + y = 50
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copy and paste the above linear system in standard form into this matrix-method solver:
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solution by matrix method:
x = father = 39
y = son = 11
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now by elimination:
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( x - 5y = -16 ) * -1
x + y = 50
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-x + 5y = 16
x + y = 50
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add the system:
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6y = 66
y = 11
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x + 11 = 50
x = 39
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solution by elimination method:
x = father = 39
y = son = 11
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the methods agree !
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