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Choose the value of the y determinant (Dy) in the following system.
3x – y = 7
2x + 5y = 4
 one year ago
 one year ago
Choose the value of the y determinant (Dy) in the following system. 3x – y = 7 2x + 5y = 4
 one year ago
 one year ago

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exploringphysicsBest ResponseYou've already chosen the best response.0
what do you mean by y [dy] for the set of eq. ??
 one year ago

exploringphysicsBest ResponseYou've already chosen the best response.0
hey @FlyinSolo_424
 one year ago

FlyinSolo_424Best ResponseYou've already chosen the best response.0
oh sorry. and like d (little y) instead of ^y it would be the other way
 one year ago

FlyinSolo_424Best ResponseYou've already chosen the best response.0
dw:1356062104599:dw
 one year ago

FlyinSolo_424Best ResponseYou've already chosen the best response.0
@exploringphysics
 one year ago

satellite73Best ResponseYou've already chosen the best response.0
list the coefficients without the \(y\) you get \[3,7\]\[2,4\] then \(D_y=3\times 47\times 2\) if i remember correctly
 one year ago

FlyinSolo_424Best ResponseYou've already chosen the best response.0
im confused @satellite73
 one year ago

satellite73Best ResponseYou've already chosen the best response.0
did you see how i got this \[3,7\]\[2,4\]?
 one year ago

exploringphysicsBest ResponseYou've already chosen the best response.0
[3 7] [2 4] id required one can you solve this ?
 one year ago

wioBest ResponseYou've already chosen the best response.1
We start out with the system:\[ \begin{array}{cccc} 3x &–& y &=& 7 \\ 2x &+& 5y &=& 4 \end{array} \] We have our matrix by taking coefficients: \[ \begin{bmatrix} 3&1\\ 2&5 \end{bmatrix} \]We have our answer column: \[ \begin{bmatrix} 7\\4 \end{bmatrix} \]We replace the y column with the answer column:\[ \begin{bmatrix} 3&7\\ 2&4 \end{bmatrix} \]Then we find the determinant:\[ 3\times 4  7 \times 2 \]
 one year ago
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