the sum of two #'s is 6. If one # is subtracted from the other, the result is -4.

let the two numbers be x and y

so

x+y=16 let this be equation 1

x-y=-4 let this be equation 2

from equation 1 you get

x=16-y

substitute value for x in eqn 2 to get

16-y=-4

y=16+4

y=20

therefore

x=16-20

x=-4

therefore the two numbers are

20 and -4

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