How do you solve 3| 20- 9m | + 4= 25?

2 Answers
Sep 17, 2017

m=13/9 or m=3

Explanation:

3|20-9m|+4=25
3|20-9m|=25-4=21
|20-9m|=21/3=7
then either (20-9m)=7 or (20-9m)=-7
either (20-7)=9m or (20+7)=9m
either 13=9m or (27)=9m
either m=13/9 or m=3

Sep 17, 2017

m=13/9 or m=3

Explanation:

3|20-9m|+4=25
3|20-9m|=25-4=21
|20-9m|=21/3=7

Using Modulus Property that in |x| , x can be positive or negative.

then either (20-9m)=7 or (20-9m)=-7
either (20-7)=9m or (20+7)=9m
either 13=9m or (27)=9m
either m=13/9 or m=3