How do you solve 39< - 9+ 4n?

1 Answer
May 17, 2018

n > 12

in interval notation

n = (12, oo)

Explanation:

39 < -9 + 4n

add 9 to both sides

color(red)(9+)39 < cancel(-9 )+ 4n cancel(color(red)( +9))

48 < 4n

divide both sides by 4

12 < n

n > 12

in interval notation

n = (12, oo)

12 is not included try to substitute 12 in n place you will get 48<48 which is wrong

try to substitute numbers greater than 12 you will get a correct answer.