Two-step+Equations

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Two-step equations. during this wiki, I hope all of you that need help with two step equations get help with it

=1. 2a+5=30=

=find A= =well, the key thing to be solving ALL algebraic equations is to get the variable on its own= =in order to that you must undo the 5 so then you are left with the 2a. . The reason why we do this is because 5-5=0 and since 0 stands for nothing, so then it doesn't exist anymore, what ever you do to the one side you must do to the other, so it would look like this:=

=2a+5-5=30-5=

=then, we minus the last two digits which makes 25, or 2a=25 then for the last step, you divide everything by the number on the left of the variable, because you don't need it anymore and to get rid of it you divide. why? Because when their is no operation in front of a variable, it always represents multiplication and if you multiply you use the opposite operation, which turns out to be division:=

= = =and lastly, 25/2=12.5= =so then a=12.5=

for further info click on [|link]watch a video from brain pop. For students from ISB, ask your teacher for user name and password

here are some practice questions

1.2+3p=38 2.3x-4=48 3.3v+8=107 4.8t-4=92 5.12m-2=142 to get answer click here media type="youtube" key="1NgOxZZTR_c" height="385" width="480" align="center"