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3 years ago

X + 2y = 5

Mathematics

2 answers:

Inessa05 [86]3 years ago

8 0

Answer: The correct option is (C) 2.

Step-by-step explanation: We are given to find the value of the y-determinant for the following system of linear equations :

$x+2y=5~~~~~~~~~~~~~~~~~~~~~~(i)\\\\x-3y=7~~~~~~~~~~~~~~~~~~~~~~(ii)$

The y-determinant for the above system is written as

$D(y)=\begin{vmatrix}1 & 5\\ 1 & 7\end{vmatrix}$

The value of the y-determinant will be

$D(y)=\begin{vmatrix}1 & 5\\ 1 & 7\end{vmatrix}=1\times7-1\times5=7-5=2.$ .

Thus, the required value of the y-determinant is 2.

Option (C) is CORRECT.

Dafna11 [192]3 years ago

3 0

B. 2
if any other number was in there i dont think it would work because its neg

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step(i)

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Step(ii):-

we know that

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cross multiplication , we get

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