तुलनात्मक विधि से हल करो : Solve by con
1. 3x +y= 13; 3y-x=9
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Step-by-step explanation:
3x+y= 13
,x+y=13/3
,y=13/3 -x
3y-x=9
,y-x=9/3
,y=3+x
13/3-x = 3+x
,13-x=9+x
,-x-x= -13+9
,-2x= -4
,x=2
y=3+x
,y=3+2
=5
x=2 y=5
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