SOLUTION: Please help me to solve the system: r+d=9 r-d=-5

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Question 234055: Please help me to solve the system: r+d=9
r-d=-5
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
solve the system:
r+d=9
r-d=-5
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Add the two equations and solve for "r":
2r = 4
r = 2
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Substitute into r+d = 9 to solve for "d":
2+d = 9
d = 7
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Cheers,
Stan H.