Posted by jose on Sunday, May 23, 2010 at 6:18pm.
I had these problems on my test and for some reason got them wrong. Here are the problems:
Solve:
xy=9
x+y=1
The test states that the answer is (5,4)
I've checked ,y work and used substitution to solve this and still get x=4, y=5.
The second problem is:
Solve the system of equations by graphing.
a=1/2b+5
a4b=2
The answer is (6,2)
Again i got the reverse of this; (2,6).
I have been at these for several hours and want to pull my hair out. Are my answers really wrong or is it the test? HELP!
Thanks

introductory algebra  Damon, Sunday, May 23, 2010 at 6:22pm
xy=9
x+y=1
The test states that the answer is (5,4)
I've checked ,y work and used substitution to solve this and still get x=4, y=5.

Check your answer
4  5 = 9 yes
4 + 5 = 1, not +1 wrong
Now adding the two equations
2 x = 10
x = 5
then
5+y = 1
y = 4

introductory algebra  Damon, Sunday, May 23, 2010 at 6:29pm
a=1/2b+5
a4b=2
substitute (1/2) b + 5 for a
(1/2) b + 5  4 b = 2
b + 10  8b = 4
7 b = 14
b = 2
then
a = 1 + 5 = 6
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