Math
posted by Jon on .
Use Cramer's Rule to solve: 3x5y=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)

If you will "plug in" x = 2 and y=3 to either equation, you will see that your solution is incorrect.
Cramer's rule involves using the determinants of matrices. You do have the denominator determinant (26) correct. The numerator for y is wrong. It should be 78. y = 3