Please help I have no idea how to do this problem: Use Cramer's Rule to solve each system.

Question

1. 2x+y=4
3x-y=6
2. 2x+3y+ z= 5
x+y-2z= -2
-3x +z=-7

Answer 1

Cramer's rule

2) Given equations are 2x  + 3y  + z  = 5 ---> (1)

x  + y  - 2z  = -2 ---> (2)

-3x  + z  = -7 ---> (3)

Write the equations into matrices form AX  = B .

A  is Coefficient matrix , X  is variable matrix and B  is Constant matrix.

Solution

Answer 2

Cramer's rule

1) Given equations are 2x  + y   = 4 ---> (1)

3x  - y   = 6 ---> (2)

Write the equations into matrices form AX  = B .

A  is Coefficient matrix , X  is variable matrix and B  is Constant matrix.

Solution :