Question

x+y =5 and xy = -1800
Find x and y

Answer 1

Answer:

x = 45 ; y = -40

x = -40; y = 45

Step-by-step explanation:

x+y =5 ==> x = 5-y

xy = -1800

(5-y) y = -1800

5y-y² = -1800

y²-5y-1800 = 0

y²+40y-45y-1800 = 0

y(y+40)-45(y+40) = 0

(y+40)(y-45) = 0

y = 45, -40

y = 45 45x = -1800

x = -1800/45

= -40

y = -40 -40x = -1800

x = -1800/-40

= 45