SOLUTION: x + y + z = 200 3x + 5y + 4z =870 y=4z You can use substitution solve the system above. Substitute 4z for y in the first two equations. What new system in two variables do you g

Question 820650: x + y + z = 200
3x + 5y + 4z =870
y=4z
You can use substitution solve the system above. Substitute 4z for y in the first two equations. What new system in two variables do you get?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
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x + y + z = 200
3x + 5y + 4z = 870
y = 4z
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put the system of linear equations into standard form
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x + y + z = 200
3x + 5y + 4z = 870
y - 4z = 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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answer:
x= 50
y= 120
z= 30
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Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
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Solve systems of linear equations up to 6-equations 6-variables:
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