Please don't answer if you don't know the answer! DONT HELP KATIE F!

label Algebra
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

Mar 21st, 2015

To substitute, we fist need one variable in terms of the other (plus a constant). Rearrange the first equation to get y in terms of x:

-x + y = 9

y = 9 + x

Substitute this value of y into the second equation:

x - y = -9

x - (9+x) = -9

x - 9 - x = -9

-9 = -9

This is true, for all values of (x,y) satisfying y = 9+x. So there are infinite solutions to this system of equations.


You can see this if you graph the lines - they're identical, i..e they perfectly overlap. So any point on the line is a solution to both equations = infinite solutions.

Mar 21st, 2015

Did you know? You can earn $20 for every friend you invite to Studypool!
Click here to
Refer a Friend
...
Mar 21st, 2015
...
Mar 21st, 2015
Aug 22nd, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer