Question

if x = -2 and x^2+y^2 +3xy = -5 then find y

Answer 1

Answer:

y =3

Step-by-step explanation:

x^2+y^2 +3xy = -5

insert x = -2

therefore;

(-2)^2 + y^2 +3* -2 *y= -5

y^2 - 6y + 9 =0

by factorising;

y^2 - 3y -3y + 9 =0

y(y -3) -3( y-3) =0

(y -3) =0or (y -3) =0

therefore y=3