Question

find weather (√2,3√2) is a solution of x-3y=9

Answer 1

x-3y=9
x-3y-9=0
√2-3y-9=0
1.41-3y-9=0
-7.59-3y=0
-7.59=3y
-7.59/3=y
-2.53=y
x-3y=9
x-3(-2.53)=9
x-(-7.59)=9
X+7.59=9
X=9+7.59
X=16.59
(X,y) (16.59, -2.53)

this is your answer....

Answer 2

in (√2,3√2) x=√2 and y=3√2
substituting x and y values in x-3y=9
√2-3(3√2)=9
√2-9√2=9
-8 root 2 =9
L.H.S is not equal to R.H.S
:. IT IS NOT A SOLUTION OF X-3Y=9