Question 930180
x = father age
y = younger son age
z = older son age
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z - y = 3
y + 20 + z + 20 = x + 20
x - y = 9(z - y)
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put the system of linear equations into standard form
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-y + z = 3
x - y - z = 20
x + 8y - 9z = 0
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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 = father age = 31
y = younger son age = 4
z = older son age = 7
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