math
posted by Anonymous .
Ex 2:
2x+7=22
2x+77=227
2x=15
2x/(2)=15/(2) I do not have to switch the equality sign. Even if I did it would not look any different.
x=7.5
Check:
2x+7=22
2(7.5)+7=22 my solution is that x=7.5 so I will just put that in to see if it works.
15+7=22
22=22
Yes. It does work. I have solved it correctly for sure. And I can write my solution as {xx=7.5} but usually with equations we just leave the solution as x=7.5 because x is just one value and not a whole set. But you can use this set notation here too if you like.
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