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May 29, 2015

Homework Help: Math

Posted by Jon on Tuesday, February 26, 2008 at 2:47pm.

Use Cramer's Rule to solve: 3x-5y=21 and 4x+2y=2.

a=3, b=-5, c=4, d=2, e=21, f=2
21(2)-(-5)(2) divided by 3(2)-(-5)(4)
=52/26= x=2

3(2)-21(4) divided by 3(2)-(-5)(4)
=78/26= y=3
answer:
(2,3)

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