1)Cramer's Rule is used to solve the system of equations:3m-5n=12,4m+7n=-5

Question

Which determinant represents the numerator for n?
answer=[12 -5]
[-5 7]

2)Cramer's Rule is used to solve the system of equations:3x-y+2z=17,4x+2y-3z=10,and 2x+5y-9z=-6

Which determinant represents the numerator for z?
answer=[3 -1 17]
[4 2 10]
[2 5 -6]

3)Which matrix would NOT be used to write a matrix equation for the system of equations:5m-2n=13 and -m+n=-2?
answer=[5 -2]
[-1 1]

4)Which product would be used to solve the matrix equation below by using inverse matrices?
[3 -4][a] [6]
[2 1] [b]= [7]
answer=1/11[1 4] [6]
[-2 3][7]
Thanks for the help:)

Answer 1

I am so stuck on these same exact problems on my Algebra 2 test.

Answer 2

[3 12]
[4 -5]

is the answer for the 1