# How do you solve #1 - 4a > 21#?

##### 1 Answer

May 23, 2018

#### Explanation:

#"subtract 1 from both sides"#

#cancel(1)cancel(-1)-4a>21-1#

#-4a>20#

#"divide both sides by "-4#

#color(blue)"reversing the sign as a consequence"#

#a< -5" is the solution"#

#a in(-oo,-5)larrcolor(blue)"in interval notation"#