X+y=0, x-y=k. If the ordered pair (1,p), where x=1 and y=p, is the solutions to both equations, what is k
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X+y=0, x-y=k. If the ordered pair (1,p), where x=1 and y=p, is the solutions to both equations, what is k

[From: ] [author: ] [Date: 11-06-08] [Hit: ]
......
a) -2
b) -1
c) 0
d) 1
e) 2
Also explain how to figure this out, thanks xox

-
x + y = 0
1 + p = 0
p = -1

1 - (-1) = k
1 + 1 = k
k = 2

E

-
e. 2

Two equations in two unknowns: x + y = 0 and x - y = k
Add the two equations together to obtain: 2*x + y - y = 0 + k
2*x = k where x=1
Therefore k = 2

-
b
)-1
1
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