Question

if 2x+6y=60 and xy=1 find x^2+9y^2​

Answer 1

Step-by-step explanation:

it is given that xy=1 that means both values are 1

So

putting value of x and y

(1)^2+9(1)^2

we get

1+9=10

Answer 2

Answer:

894

Step-by-step explanation:

Given,

$2x+6y=6, xy=1$

divide by 2 on L.H.S and R.H.S

⇒$x+3y=30$

squaring on both sides

⇒$(x+3y)^{2} =30^{2}$

⇒$x^{2} +9y^{2}+6xy=900$

$x^{2} +9y{2}=900-6=894$ (xy=1 )