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Virty [35]
3 years ago
14

In the equation 3x+9=27 how to solve?

Social Studies
2 answers:
Mandarinka [93]3 years ago
8 0
The rule to solving these is to get x on its own by performing 'operations'. However, whatever we do the left-hand side we must also do to the right hand side. So,

3x+9=27, firstly that +9 is messing up the x so we take away 9 from the left to get rid of it but also take away 9 on the right because we have to.

3x+9-9=27-9 \Rightarrow 3x=18, next see that the 'times 3' is messing up the x so we divide the left-hand side by 3 to get rid but then also divide the right hand side because we have to.

3x \div3=18\div 3 \Rightarrow x=6 and then you have your solution.

Questions like this are all about figuring how to get the x on it's own but also remembering to do whatever you do on BOTH sides of the equals. Hope this helps.
gulaghasi [49]3 years ago
5 0
Hey there! :D

3x+9= 27

Since 9 is being added, you subtract it from both sides. 

3x+9 (-9)= 27(-9)

3x= 18

Divide both sides by 3, since 3 is being multiplied by x.

x=6

I hope this helps!
~kaikers
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