You can put this solution on YOUR website! x = anna age
y = david age
z = preeya age
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x + y + z = 21
x = 2y
z = 2x
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put the system of linear equations into standard form
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x + y + z = 21
x - 2y = 0
2x - z = 0
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solution:
x = anna age = 6
y = david age = 3
z = preeya age = 12
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