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Standard IX

Mathematics

Relation between Variables and Equations

For simultane...

Question

For simultaneous equation in variable x and y, $D_{x} = 49, D_{y} = - 63, D = 7$ then what is x?

7

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- 7

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\frac{1}{7}

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\frac{- 1}{7}

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Solution

The correct option is A $7$
$x = \frac{D_{x}}{D} = \frac{49}{7} = 7$

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Similar questions

Choose correct alternative for each of the following questions
(1) To draw graph of 4x +5y = 19, Find y when x = 1.

A) 4

(B) 3

(D) –3

(2) For simultaneous equations in variables x and y, D_x= 49, D_y = –63, D = 7 then what is x ?

A) 7

(B) –7

(C)

\frac{1}{7}

(D)

\frac{- 1}{7}

(3) Find the value of

|\begin{matrix} 5 & 3 \\ - 7 & - 4 \end{matrix}|

A) –1

(B) –41

(D) 1

(4) To solve x + y = 3 ; 3x – 2y – 4 = 0 by determinant method find D.

A) 5

(B) 1

(D) –1

(5) ax + by = c and mx + ny = d and an ≠ bm then these simultaneous equations have -

(A)	Only one common solution.	(A)	No solution.
(C)	Infinite number of solutions.	(D)	Only two solution.

Q. The equation

x = 7

, in two variables can be written as ___.

Q. Question 6
The equation x = 7, in two variables, can be written as:

A) 1.x + 1.y = 7
B) 1.x + 0.y = 7
C) 0.x + 1.y = 7
D) 1.x - 1.y = 7

Q. If

y = x^{x} + x^{7} + 7^{x} + 7^{7}

, then

\frac{d y}{d x} = ?

Q. If

D = 7, D_{x} = 35

and

D_{y} = 42

are the values of the determinants for certain simultaneous equations in

x

and

y

, then find the values of

x

and

y

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For simultaneous equation in variable x and y, Dx=49,Dy=−63,D=7 then what is x?

The correct option is A 7x=DxD=497=7

For simultaneous equation in variable x and y, $D_{x} = 49, D_{y} = - 63, D = 7$ then what is x?

The correct option is A $7$
$x = \frac{D_{x}}{D} = \frac{49}{7} = 7$