Question

Choose the value of the y determinant (Dy) in the following system.

3x – y = 7
2x + 5y = 4



17

39

28

–2

Answer 1

The y determinant involves replacing the y coefficients with the constant terms.

Dy = | 3 7 | = (3)(4) - (7)(2) = 12 - 14 = -2
| 2 4 |

Answer 2

does that make sense? It's like the regular determinant, but in the 2nd column, you put in 7 and 4 in place of the y-coefficients.

Answer 3

so it's -2? thnx, bro! :)

Answer 4

glad to help :)