Find x if f(x) = 2x + 7 and f(x) = -1.

-4
-3
5

how do i do this one same concept but its diffrent rite.....@ilfy214

Question

Find x if f(x) = 2x + 7 and f(x) = -1.


-4
-3
5


how do i do this one same concept but its diffrent rite.....@ilfy214

anonymous · Answer

Ok

anonymous · Answer

ilfy214 you were here first

anonymous · Answer

If you want to solve it go ahead

anonymous · Answer

Definitely different because $$f(x) = y = -1$$ Now you can plug it in.

anonymous · Answer

@ilfy214  has been helping me for a while

anonymous · Answer

Go ahead @Microrobot if you want to! :) We're all helping here

anonymous · Answer

i dont mind either

anonymous · Answer

Now you can insert the -1 $$ f(x) = y = -1$$$$ f(x) = 2x + 7$$$$-1 = 2x + 7$$Got it?

anonymous · Answer

Ok, you can take this one dont worry

anonymous · Answer

ok so.....lets see here im not getting the way the equation is set can you explainit more????

anonymous · Answer

i think its 3

anonymous · Answer

f(x) is also another way of saying y. If -1 is equal to f(x) then it is also equal to y. Look at it like this. Maybe it will help. $$f(x) = -1$$$$y = -1$$$$y = 2x + 7$$$$-1 = 2x + 7$$Can you do the rest?

anonymous · Answer

@JupitersBrain You gotta explain it first before you just give out the answers.. lolz

anonymous · Answer

Also, that isn't the answer...

anonymous · Answer

$$−1=2x+7$$$$−8=2x$$$$−4=x$$Not 3