Question

find the product and then evaluate when x =2,y=-1
(b) -11x [2y^5-3/11x^2y^3​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

ANSWER

Put x+y=u and xy=v. Then the given equations can be written as

u+v=11,uv=30

∴ u and v are the roots of t2=11t+30=0

Hence u=6,v=5 or u=5,v=6.

Thus x+y=6,xy=5 or x+y=5,xy=6

First we take x+y=6   ..(1)

and xy=5

∴ x and y are the roots of t−6t+5=0

or (t−5)(t−1)=0,

∴t=5,1

Hence x=5,y=1 or x=1,y=5.

We now take x+y=5,xy=6.

Solving these, we shall get t2−5t+6=0

x=3,y=2 or x=2,y=3

Hence the solution set is (5,1),(1,5).(3,2),(2,3).