Question

Choose the value of the y determinant (Dy) in the system.
x + 6y = –3
4x – 9y = 2
–33
–10
14
15

Answer 1

\[\begin{vmatrix}Dx&D&Dy\\1&-3&6\\4&2&-9\end{vmatrix}\]

Answer 2

I DONT GET IT , WHATS NEXT?

Answer 3

Do a cross like you would on vectors and you should have it; except the D would not need to go negative

Answer 4

im still confused , what do i divide

Answer 5

your not dividing; your taking the determinant of the submatrix associated with Dy

Answer 6

so what am i sapossed to do ?

Answer 7

... you sposed to take the determinant of the submatrix associated with Dy :/

Answer 8

i dont know how

Answer 9

then i spose youve asked the wrong question since the nature of this question presupposes that you have an inkling of an idea on what to do when asked for the value of Dy as the determinant of the indicated system

Answer 10

nevermind , i'll just guess

Answer 11

if we ignore the impertinent parts, we are left with this to base our solution on
\[\begin{vmatrix}&&Dy\\1&-3&\\4&2&\end{vmatrix}\]

assuming you know how to take the determinant of a 2x2 matrix that is