Question

3x - 2y = - 6;
5x - 2y = - 10
Solve using cranmer's rule

Answer 1

Answer:

-16 is the correct answer

Answer 2

Answer:

Step-by-step explanation:Make a single variable the subject:

3x+2 y = 6

   

2 y = 6 − 3 x

   

→ y = 3 − 3 x 2

Substitute this expression for  y  in the first equation:

5x − 2 y = 10

5 x − 2 ( 3 − 3 x 2 ) = 10

5 x − 6 + 3 x = 10

8 x = 16

x = 2

y = 3 − 3 ( 2 ) 2

y = 0

Compare the Elimination method

   5 x − 2 y = 10    ... . A

  3 x + 2 y = 6 −−−−−−−−−−−  ... . . B

8 x = 16

   

← A + B × × x . x x = 2

Substitute in  B

3 x + 2 y = 6

3 ( 2 ) + 2 y = 6

6 + 2 y = 6

y = 0