March 28, 2017

Post a New Question

Posted by on .

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

  • Math - ,

    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

Answer This Question

First Name:
School Subject:

Related Questions

More Related Questions

Post a New Question