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

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) (Show Source): You can put this solution on YOUR website!

The (-36) is incorrect. It should be 9*(-5) or -45.
Make that correction and try it.
It should work.
RELATED QUESTIONS
This is Solving Linear Systems by Linear Combinations (substitution not allowed). This... (answered by stanbon)

Hello, I have recently started learning about the systems of linear equations. I... (answered by Earlsdon)

How do I use linear combinations to solve this linear system: y=x-9 (answered by mananth)

How do i use linear combinations to solve the system of this linear equation 2a+6z=4 (answered by stanbon)

Please help me solve this linear equation. I am supposed to use substitution and I can't... (answered by rfer)

I�m very confused about solving this problem and its supposed to be solved using... (answered by akmb1215)

May you please help me with this problem: 5e+4f=9 4e+5f=9 The instructions are to... (answered by Alan3354)

I am supposed to solve a linear equation using the method of elimination, I have retried... (answered by Fombitz,acalgebra,CharlesG2)

OK, so I know the following is incorrect, so could you help me to figure out what I am... (answered by LarissaRichardson,unlockmath)