Question

U will get 25 marks ....Plzzz solve it it's urgent ....plz solve it by option...

Answer 1

The correct option is (d)

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Now, see....

choose the equation which have to simplify easily.
Here, x+ 2y+3z= 13.

Put the value of;
x= -10
y= 10
z= 1

You, will get = to RHS.
_____________________

Hope you get it✌✌

#Amrit⭐

Answer 2

Here is your answer :

=> 3x - 4y + 70z = 0 ------- ( 1 )

=> 2x + 3y - 10z = 0 -------- ( 2 )

=> x + 2y + 3z = 13 --------- ( 3 )

From ( 1 ) and ( 2 ),we get ,

=> 3x - 4y + 70z = 2x + 3y - 10z

=> 3x - 2x - 4y - 3y + 70z + 10z = 0

=> x - 7y + 80z = 0

•°• x = 7y - 80z. -------- ( 4 )

Substitute the value of ( 4 ) in ( 2 ),

=> 2x + 3y - 10z = 0

=> 2( 7y - 80z ) + 3y - 10z = 0

=> 14y - 160z + 3y - 10z = 0

=> 14y + 3y - 160z - 10z = 0

=> 17y - 170z = 0

Talking 17 as common,

=> 17 ( y - 10z) = 0

=> ( y - 10z ) = 0 ÷ 17

•°• ( y - 10z ) = 0 --------------- ( 5 )

Substitute the value of ( 4 ) in ( 3 ),

=> x + 2y + 3z = 13

=> 7y - 80z + 2y + 3z = 13

=> 7y + 2y - 80z + 3z = 13

=> 9y - 77z = 13 --------------- ( 6 )

By multiplying to 9 in ( 5 ),

=> 9( y - 10z ) = 0 × 9

=> 9y - 90z = 0. ---------- ( 7 )

Subtracting ( 6 ) from ( 7 ),

=> 9y - 90z - ( 9y - 77z ) = 0 - 13

=> 9y - 90z - 9y + 77z = - 13

=> - 13z = -13

=> z = ( -13 ) ÷ ( -13 )

•°• z = 1

Substitute the value of z in ( 5 ),

=> y - 10z = 0

=> y - 10 × 1 = 0

=> y - 10 = 0

•°• y = 10

Now, substitute the value of y and z in ( 1 ),

=> 3x - 4y + 70z = 0

=> 3x - 4( 10 ) + 70 ( 1 ) = 0

=> 3x - 40 + 70 = 0

=> 3x + 30 = 0

=> 3x = -30

=> x = ( -30 ) ÷ 3

•°• x = ( -10 ).

Hence,

( x = -10 ) , ( y = 10 ) , ( z = 1 ).

Ans : ( d ) ( -10 , 10 , 1 )

Verification :

( i )

=> 3x - 4y + 70z = 0

=> 3( -10 ) - 4( 10 ) + 70( 1 ) = 0

=> -30 - 40 + 70 = 0

=> -70 + 70 = 0

•°• 0 = 0

( ii )

=> 2x + 3y - 10z = 0

=> 2( -10 ) + 3 ( 10 ) - 10( 1 ) = 0

=> -20 + 30 -10 = 0

=> -30 + 30 = 0

•°• 0 = 0

( iii )

=> x + 2y + 3z = 13

=> ( -10 ) + 2 ( 10 ) + 3 ( 1 ) = 13

=> -10 + 20 + 3 = 13

=> 23 - 10 = 13

•°• 13 = 13

Verified

Ans : ( d ) ( -10 , 10 , 1 )

Hope it helps !!