SOLUTION: Solve the system of equations x + y = 5 x - y = -9

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Question 474394: Solve the system of equations
x + y = 5
x - y = -9
Answer by mananth(16946) About Me  (Show Source):
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1 x + 1 y = 5 .............1
1 x -1 y = -9 .............2

multiply (1)by 1
Multiply (2) by 1
1 x + 1 y = 5
1 x + -1 y = -9
Add the two equations
2 x = -4
/ 2
x = -2
plug value of x in (1)
1 x + 1 y = 5
-2 + 1 y = 5
1 y = 5 + 2
1 y = 7
y = 7.