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x= -9
y= -5/13
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3x-y=4    => 3x=4+y => x=4+y/3 =>substitute the value of x in 9x=2y+7                            9(4+y/3)=2y+7 => 36+9y/3=2y+7 =>36+9y=6y+21 =>9y-6y=21-36 =>3y=-15                y=-5      substitute the value of y in 3x-y=4 => 3x-(-5)=4 =>3x+5=4=>3x=4-5=>x =-1/3              x=-1/3  y=-5
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