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filou222 filou222
  • 23-11-2014
  • Mathematics
Answered

Substitution methode:

y=2x-5

4x-y=7


I thought you do it like this:

4x-2x-5=7

2x-5=7

2x=12

x=6

But that's not right.. What did I do wrong?

Verified Answer :

konrad509
konrad509 konrad509
  • 23-11-2014

It should be 4x-(2x-5)=7.

\(4x-(2x-5)=7\\ 4x-2x+5=7\\ 2x=2\\ x=1\)

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