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solve and graph

I submitted the following but people were not reading the negative sign before the -9, so here it is 6-(-9f)<-3. I don't know if I make the -9f positive since there is a negative sign in front or what to do first. Thank you
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1 Answer

6 - (-9f) < -3
 
Yes, the -(-9f) becomes a +9f:
 
6 + 9f < -3
 
9f < -9         [Subtracted 6 from both sides]
 
f < -1          [Divided both sides by 9]
 
Check:
 
f=-1:  6-(-9(-1)) = 6-(9) = -3, which is equal to but not less than -3 as expected (since f ≥ -1)
 
f=-2:  6-(-9(-2)) = 6-18 = -12 which is less than -3 as expected (since f < -1)
 
f=0:  6-(-9(0)) = 6-0 = 6  which is > -3 as expected (since f > -1)
 
Graph:
   -3    -2   -1   0  1   2
<=|==|==o--|--|--|->