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May 28, 2015

Homework Help: algebra

Posted by Alyssa on Tuesday, April 5, 2011 at 10:27am.

i need help with these problems (either a solution or how to plug them into a graphing calculator):

1) Solve by substitution or elimination

4/x + 1/y + 2/z = 4

2/x + 3/y - 1/z = 1

1/x + 1/y + 1/z = 4

2)Solve the system of equations by substitution.

x^2 + y^2 = 25
x - y = 7

3) Solve the system of equations by substitution. Round the answer to the nearest hundredths.

9x^2 + 16y^2 = 140
x^2 - 4y^2 = 4

4)Solve by elimination:

1/x + 3/y = 7

4/x - 2/y = 1

Thanks!

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