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September 20, 2014

September 20, 2014

Posted by **Mary Troy** on Saturday, November 6, 2010 at 12:35pm.

- Math -
**Mary Troy**, Saturday, November 6, 2010 at 12:45pm1) 20x + 45y = 6800

2) 20(250 - y) + 45y = 6800 {multiply 20 through the parentheses}

3) 5000 - 20y + 45y = 6800 {combine the y terms 45y - 20y = 25y}

4) 5000 + 25y = 6800 {subtract 5000 from both sides}

5) 25y = 1800 {divide 25 from both sides}

6) y = 72

Now put y back into equation 1) x + y = 250

1) x + 72 = 250

2) x = 250 - 72

3) x = 178

- Math -
**PsyDAG**, Saturday, November 6, 2010 at 1:37pmTo check, put both values back into the second equation.

20(178) + 45(72) = 6800

3560 + 3240 = 6800

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