naudiaayers naudiaayers
  • 21-11-2021
  • Mathematics
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The sum of two numbers is −138. Their difference is −2. Find the numbers

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Beedex
Beedex Beedex
  • 21-11-2021
ANSWER: The numbers are -70 and -68


EXPLANATION:
x+y = -138 eqn i
x-y = -2 eqn ii

From eqn ii
x-y = -2
x = -2 + y

Substitute x = -2 + y into eqn i
We have
-2 + y + y = -138
2y = -138 + 2
y = -68


Substitute y = -68 into eqn ii to get the value of x
x - y = -2
x -(-68) = -2
x + 68 = -2
x = -2 -68
x = -70
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