Monday

October 20, 2014

October 20, 2014

Posted by **chrissy** on Sunday, September 13, 2009 at 6:45pm.

Let a, b, and c be real numbers such that a-7b+8c=4 and 8a+4b-c=7. Then a^2-b^2+c^2= ?

can someone please help?! i don't know what method to use to solve this or where to start

- math - repost answered -
**MathMate**, Sunday, September 13, 2009 at 9:02pmSee answer here:

http://www.jiskha.com/display.cgi?id=1252885572

**Answer this Question**

**Related Questions**

mathhh! - My teacher said we are supossed to solve this using systems of ...

7th grade Math - I'm supossed to cme up with a real world problem and then ...

algebra - 1 Solve the set of linear equations by the matrix method : a+3b+2c=3...

Math (Algebra) - A and B are real numbers such that the two quadratic equations ...

Alg 2 - Today we learned how to solve systems of equations with 3 variables, ...

Algebra - Can someone please help solve this? Solve by using addition or ...

Math - Could someone give me an example of a linear eqution using elimination to...

Algrebra-Systems of Equations - Kasey is thinking of 2 munbers. The sum of the ...

Algrebra-Systems of Equations - Kasey is thinking of 2 munbers. The sum of the ...

MATH - system of linear equation The sum of 3 numbers is 14 the largest is 4 ...