X + 7y = 10————( 1 ) 3x 2y = 7————( 2 ) from—— ( 1 ) amp; ——–( 2 ) multiply by —(3)* in — ( 1) 3x + 21y = 30 3x 2y = 7 ( )___(+)__( ) ——————– 23y = 2 ...

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Byju's Answer

Standard X

Mathematics

Arithmetic Mean

x+7 y=10 ; 3 ...

Question

x+7y=10 ; 3x - 2y =7

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Solution

x + 7y = 10------------( 1 )
3x - 2y = 7------------( 2 )

from-------( 1 ) & --------( 2 )
multiply by ---(3)* in ----( 1)

3x + 21y = 30
3x - 2y = 7
(-)_(+)(-)
--------------------
23y = 23

Y = 1 [ put in ---( 1 ) ]

we get,

X + 7y = 10

x + 7(1) = 10

x = 10 - 7

x = 3 , y = 1

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x+7y=10 ; 3x - 2y =7

x + 7y = 10------------( 1 ) 3x - 2y = 7------------( 2 ) from-------( 1 ) & --------( 2 ) multiply by ---(3)* in ----( 1) 3x + 21y = 30 3x - 2y = 7 (-)___(+)__(-) -------------------- 23y = 23 Y = 1 [ put in ---( 1 ) ] we get, X + 7y = 10 x + 7(1) = 10 x = 10 - 7 x = 3 , y = 1

x + 7y = 10------------( 1 )
3x - 2y = 7------------( 2 )

from-------( 1 ) & --------( 2 )
multiply by ---(3)* in ----( 1)

3x + 21y = 30
3x - 2y = 7
(-)_(+)(-)
--------------------
23y = 23

Y = 1 [ put in ---( 1 ) ]

we get,

X + 7y = 10

x + 7(1) = 10

x = 10 - 7

x = 3 , y = 1