SOLUTION: The UPS delivery man is delivering Christmas presents. The combined weight of the packages is 90 lb. He has 2 fewer 15 lb packages than 5 lb and twice as many 10 lb packages as 5 l

Question 820252: The UPS delivery man is delivering Christmas presents. The combined weight of the packages is 90 lb. He has 2 fewer 15 lb packages than 5 lb and twice as many 10 lb packages as 5 lb packages. How many of each weight package does he have?
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
5x + 10y + 15z = 90
z = x - 2
y = 2x
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put into standard form:
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5x + 10y + 15z = 90
x - z = 2
2x - y = 0
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plug the above standard form equations in to this solver:
https://sooeet.com/math/system-of-linear-equations-solver.php
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answer:
x= 3
y= 6
z= 1
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https://sooeet.com/math/linear-equation-solver.php
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Solve quadratic equations, quadratic formula:
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Solve systems of linear equations up to 6-equations 6-variables:
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