Question

If x+y=7 and xy=10, find x

Answer 1

Answer:

Please look attachment!!

Hope it is helpful

Answer 2

Answer:

x+y=7

x=7-y (eq-1)

xy =10

using eq-1 , put the value of x

(7-y) y=10

7y-y^2=10

y^2-7y+10=0

y^2-5y-2y+10=0

y(y-5)-2(y-5)=0

(y-2)(y-5)=0

y=2 and 5.

if y=2 then x=5

if y=5 then x=2