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October 21, 2014

October 21, 2014

Posted by **rufus** on Monday, April 7, 2008 at 9:33am.

1)Given that one cassette cost $x and one cd cost $y,write two equations in x and y to represent this information.

2)Calculate the cost of one cassette.

- math -
**Reiny**, Monday, April 7, 2008 at 9:52am1. just translate the English into Math

"Two cassettes and three cd's cost $175" ---> 2x + 3y = 175

"four cassettes and one cd cost $125" ---> 4x + y = 125

2. double the first equation

4x + 6y = 350 then subtract the second

4x + y = 125

-------------

5y = 225

y = 45

back in the second

4x + 45 = 125

4x = 80

x = 20

(expensive cassettes and CDs)

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