Question

Find the value of mn, if
m +n = 8 and m-n=2​

Answer 1

Answer:

m=5 , n = 3

therefore, mn = 15

Answer 2

m + n = 8 ......(1)

m - n = 2 ........(2)

Adding equations (1) and (2)

m + n = 8

m - n = 2

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2m = 10

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2m = 10

=> m = 5 ....... substitute in equation (1)

5 + n = 8

=> n = 4

Thus, mn = (5)(3) = 15