Question

plzzzzzzzzzzzzzzzz..... asking angel....

Answer 1

hiii Friend...
_____
good evening......



here's your answer

if x-y = 7 ---------> equation (i)
xy = 9 ---------> equation (ii)

by equation (ii)
xy = 9
y = 9/x -----------> equation (iii)

equation (III) to value of y put in equation (i)

x-y = 7
x-9/x = 7

(x^2 - 9)/x = 7

(x^2 - 7x - 9) = 0

solve this quadritic equation

x=( -b +-√b^2-4ac )/2a

x= (7 +-√49+36) / 2

x = (7 +- √85 ) /2

x =( 7+√85) / 2 ; (7-√85)/2

xy = 9. (according to equation (ii) )

y = 18/7+√85 ; 18/7-√85