If 2x+3=90, then does 2x+4=100

If 2x+3=90, then does 2x+4=100  (???)

Here's one quick way to solve this -  this "method" won't always work, but it does in this case.

Subtract 3 from both sides in the first equation and 4 from both sides in the second.

Then, in the first equation 2x = 87

But, in the second equation, 2x = 96

And since "2x" has to be the same thing in each case, then it's impossible for it to equal both 87 and 96 at the same time!!! So the second equation isn't valid, given the first!!

We're "cheating" a little bit here, but what the heck??..... I'm lazy!!!  

Do the math

Hi,

CPhill's answer is quite valid.  Is the person asking CPhill to 'do the math' the original question asker?

Whether you are or not you can ask more politely thank you very much!

Melody.