introductory algebra
posted by jose
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

Damon
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 
Damon
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
Respond to this Question
Similar Questions

thx 4 the help roger
thx 4 the help i got the steps You're welcome and I'm glad you understood the steps. Now use that strategy with your other word problems. Identify what the variable(s) are, convert them to equations, then solve the equations. Always … 
Algergra
I am stumped! I have been working on these problems for the longest time and I can not figure out what I am doing wrong. Some how when I get to the last two steps I mess up, and I am beyond frustrated. The directions say: Write an … 
math
On a test, Abbey had 75% of the problems right. If she had 48 problems correct, how many questions were on the test? 
math
On a test, Abbey had 75% of the problems right. If she had 48 problems correct, how many questions were on the test? 
Math
On a test, Abbey had 75% of the problems right. If she had 48 problems correct, how many questions were on the test? 
Math
Diane took a math test. The ratio of the number of problems Diane got incorrect to the number of problems she got correct was 2:7. If the test had 36 questions on it, how many problems did she get correct? 
algebra homework help
A student missed 8 problems on a Chemistry test and received a grade of 47%. If all the problems were of equal value, how many problems were on the test? 
algebra homework help
A student missed 3 problems on a Physics test and received a grade of 94%. If all the problems were of equal value, how many problems were on the test? 
algebra
A student missed 11 problems on a Chemistry test and received a grade of 65%. If all the problems were of equal value, how many problems were on the test? 
algebra homework help
student missed 11 problems on a Chemistry test and received a grade of 65%. If all the problems were of equal value, how many problems were on the test?