SOLUTION: what two numbers have a sum of -4 and a difference of 10?

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Question 933239: what two numbers have a sum of -4 and a difference of 10?
Found 2 solutions by stanbon, MathLover1:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
what two numbers have a sum of -4 and a difference of 10?
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Equations::
x + y = -4
x - y = 10
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2x = 6
x = 3
----
y = -7
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Cheers,
Stan H.
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Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

what two numbers have a sum of -4 and a difference of 10?
let two numbers be x and y

their sum is -4:x%2By=-4...eq.1
their difference is -4:x-y=10...eq.2
solve the system:
x%2By=-4...eq.1
x-y=10...eq.2
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x%2Bcross%28y%29%2Bx-cross%28y%29=-4%2B10
2x=6
highlight%28x=3%29
go to x%2By=-4...eq.1, substitute 3 for x and solve for y
3%2By=-4
y=-4-3
highlight%28y=-7%29