How do you solve #2- f = 1#?

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Answer 1 · 2018-03-06T10:55:08

#f=1#. Which number substracted to 2 has a result 1?. Only 1

Other way to arrive to the same result is using equations laws:

"A equation remains true if we add (o substract) the same number to both sides"

"A equation remains true if we multiply (o divide) by the same number to both sides"

In our case: #2-f=1# add f to both sides (1st law)

#2-f+f=1+f# but #-f+f=0#. So we have

#2=1+f#. Now adding #-1# to both sides (1st law)

#2-1=1+f-1#. By conmutative property #2-1=1-1+f# and finally we have

#1=f#