Question 101637
4. One more than the difference between 18 and 7 times a number is -9 
This is what we have tried: 
7n + 18 +1 = -9
7n + 19 = -9
7n = -28
n= -4 
Is this correct? 


YOU ARE VERY CLOSE!!!!!! WORD PROBLEMS ARE GENERALLY FAR EASIER IF YOU LAY OUT THE PROBLEM, STEP BY STEP,  AS I HAVE DONE BELOW.

Let n=the number

7 times the number is 7n

Difference between 18 and 7 times a number: 18-7n

One more than the difference between 18 and 7 times a number: (18-7n)+1
--------and we are told that this equals -9.  So:
18-7n+1=-9 simplify

19-7n=-9  subtract 19 from both sides
19-19-7n=-9-19  collect like terms

-7x=-28  divide both sides by -7

n=4------------the number


CK

18-(7*4)+1=-9

18-28+1=-9
-10+1=-9
-9=-9


Hope this helps---ptaylor