Question

please solve these questions guys ​

Answer 1

3x+y-12=0

=) 3x+y=12_________(1)

x-3y+6=0

=) x-3y= -6_________(2)

(2)*3=) 3x-9y= -18_____(3)

3x+y= 12______(1)

________________________

( 3)-(1)=) -10y= -30

=) y=30/10 = 3

y=3

sub. y=3 in (1)

=) 3x+3=12

=) 3x=12-3

=) 3x=9

=) x=9/3

=) x=3

x=3