SOLUTION: I am supposed to solve the following linear system using linear combinations. Please help me to solve this problem. I have done the following work to the problem so far: 5e + 4f

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Question 123709This question is from textbook McDougal Littell Algebra 1
: I am supposed to solve the following linear system using linear combinations. Please help me to solve this problem. I have done the following work to the problem so far:
5e + 4f = 9 *The two equations on the left are the original linear system.
4e + 5f = 9
20e + 16f = 36
+ (-20e)- 25f = -36
________________
-9f= 0
f=0
5e+4*0= 9
5e+0= 9
e=1.8
However, when I substituted these two solutions to the variables e and f, the second equation-----> 4e + 5f = 9----- was not true. Please help me to achieve the correct answer.
Much appreciated, Megan B. This question is from textbook McDougal Littell Algebra 1

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28-20e%29-+25f+=+highlight%28-36%29
The (-36) is incorrect. It should be 9*(-5) or -45.
Make that correction and try it.
It should work.