Question

For simultaneous equations in variables x and y , Dx = − 42 ,
Dy = − 18 D = -3 then find the value of y? ,

Answer 1

Answer:

x=14,y=6

Step-by-step explanation:

D=-3

-3x=-42

x=42/3=14

-3y=-18

y=18/3=6

Answer 2

Given: Dx = − 42, Dy = − 18 and D = -3.

To find: The value of y.

Solution:

• The simultaneous equations given in the question are as follows,

         $Dx = -42$

         $Dy = -18$

• Since the value of D is provided in the question, it is replaced by - 3 in the given equations.
• On replacement, the given equations can be written as,

        $(-3) x = -42$

        $(-3) y = -18$

• On cross multiplication, the equations are written as,

        $x = \frac{-42}{-3}$

        $y = \frac{-18}{-3}$

• On solving further, the values of x and y are found to be,

        $x = 14$

        $y = 6$

Therefore, the value of y is 6.