Question

if x+y = 5 and x-y = 1 then find the value of xy
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Answer 1

Answer:

4

Step-by-step explanation:

x-y = 1

x=1+y

x+y =5

put the value of x from above 2nd equation

1+y+y=5

1+2y =5

2y = 4

y = 2

put this y value in 1 st equation

x -1 = 1

x = 2

xy = 2×2

= 4