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To create an equation that could be used to eliminate two of the variables.

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If a=1 gives a wrong answer you can say a=2

It is to eliminate e

@@gadisamohammed9513 but why use -2? can any number be used in it's place to eliminate e?

He did that to eliminate variables and be left with one variable. when d an e was eliminated, b was solved. The technique is similar to that used in a simultaneous equation. If you add the two equations for the unitary b you would get 2b=6d+2e+2 (sum of equations 1 and 2) -6b=-6d-2e-12 (equation 3 times -2) -4b= 0+ 0 -10 -4b=-10 b=-10/-4 = 2.5 or 5\2 Remember your integers - divided by negative returns a positive! This seemed complicated but the strategy was to get a linear equation through elimination, solve for b and solve for the other variables by substitution.

@@MarciaArleneDebra ty.. I was not aware of the concept of simultaneous equations at that time.. thx for taking ur time to explain it to me

​@@welln0w Sorry if I'm late. It is because in the equation the value of e is 2.

That’s a great question, I’m trying it out and having a difficult time. Did you mean KMnO4 + SO2 + H2O -> K2SO4 + MnSO4 + H2SO4 instead? I’ll keep trying what you asked and if I get something I’ll let you know!

@@henrylam9984 its the same, also im in grade 9 and wanted to learn balance method. is there easy way to balance

Hi there! Yes you can use 2 or 3, what will happen if you declare another value is that the rest of the numbers will change accordingly. It’s sort of like changing the ratios to a cooking recipe. I also made a video on how to declare an arbitrary value if that helps!

How

Hi Mohamed, yes I think you can solve a systems of equations using a Casio calculator FX-991. I have never used a Casio calculator before. However, here is a video I found online that shows how to input a systems of equation in the calculator. ruclips.net/video/b4-UYhT7mkQ/видео.html Hope this helps!

Hi Mohamed, I just posted a video on the reaction! ruclips.net/video/2MlMmH4f4MI/видео.html This one is an interesting case, I have found two solutions to balance the reaction. The video is long but goes in depth in how I found a solution. You can skip to the solutions if you'd like. Also the quality of the video may be poor, it is still loading. Hope this helps!

@@henrylam9984 Thank you. I have benefited. Although the video is long, it was not longer than the day it took me to try to solve it.. I apologize for my poor English because I use Google Translate

I will also be understand 😂

Hi there! Thank you for the question. b=10/4 is the same as b=5/2. You can use either one. Make sure that your coefficients are whole numbers at the end.

He did not reduce it to the lowest terms, they are equivalent fractions.

Hi there! Yes you absolutely can! It should work. If you start with the following: (NH4)2[Cr2O7] and go through decomposition to give Cr203 + 4 H2O + N2 So 1:1:4:1 is the balanced reaction.