SOLUTION: the sum of sally's age plus three times tomas age is 21. the difference of sally's age and tomas is 5. write and solve a system of equation

Question 943657: the sum of sally's age plus three times tomas age is 21. the difference of sally's age and tomas is 5. write and solve a system of equation
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
x = sally age
y = tomas age
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x + 3y = 21
x - y = 5
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put the system of linear equations into standard form
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x + 3y = 21
x - y = 5
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copy and paste the above standard form linear equations in to this solver:
http://sooeet.com/math/system-of-linear-equations-solver.php
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solution:
x = 9
y = 4
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