Question

1.x-y=8 and xy=9 if the value of x+y?​

Answer 1

Answer:

X+Y =10 and -10

Step-by-step explanation:

having two solution

Answer 2

Answer:

x+y=-10,+10

Step-by-step explanation:

xy=9

y=9/x

x-y=8

x-9/x=8

X(x)

x^2-9=8x

x^2-8x-9=0

facto.ze

x^2+x-9x-9=0

x(x-9)+(x-9)=0

(x-9)(x+1)=0

x=9, x=-1

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y=1, y=-9

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x+y=10, x+y=-10