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#1 2019-05-26 00:54:29

Algabre
Guest

/Solve expression

7x-1=20
Help me please, thanks

#2 2019-05-26 01:00:02

ganesh
Administrator
Registered: 2005-06-28
Posts: 28,872

Re: /Solve expression

Hi Algabre,

7x-1=20.
7x=20+1.
7x=21.
x=3.


It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi. 

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

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#3 2019-05-26 01:13:18

bob bundy
Administrator
Registered: 2010-06-20
Posts: 8,594

Re: /Solve expression

hi Algabre

Welcome to the forum.

Here's a way that works for equations like these.

Draw function boxes to show what is happening to x, going left to right.

Then do the opposite starting with 20 and going right to left.

UKM7Rt7.gif

Bob


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob Bundy smile

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