SOLUTION: joan's brother is three times as old as she. in 5 years his age will be twice hers
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Question 942664: joan's brother is three times as old as she. in 5 years his age will be twice hers
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = joan age now
y = bother age now
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y = 3x
y + 5 = 2(x + 5)
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put the system of linear equations into standard form
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3x - y = 0
2x - y = -5
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copy and paste the above standard form linear equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 5
y = 15
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