Question

if 2-y=7 and xy=9 find the value of x²+y²

class 8 algebric expression and identities ​

Answer 1

2-y=7
y=7+2
y=9

xy=9
x(9)=9
9x=9
x=9/9
x=0

x^2+y^2
=0^2+9^2
=0+81
=81