geedee8812 geedee8812
  • 12-11-2018
  • Mathematics
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find two numbers whosse sum is 12 and whose difference is 4

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ivana2103
ivana2103 ivana2103
  • 12-11-2018
x + y = 12
x - y = 4

From the second equation we can see that x = 4 + y

We can plug this into the first one and get:

4 + y + y = 12
4 + 2y = 12
2y = 12-4
2y = 8
y = 4

And then we can plug that into “x” and get that x = 4 + 4, or x=8
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