How do you solve #21= | y + 685| + 6#?

1 Answer
Apr 12, 2018

Answer:

#y=-670#

Explanation:

Since everything inside of the absolute value bars (#|y+685|#) is already positive there is no need for them anymore:
#21=y+685+6#
Next add:
#21=y+691#
Then subtract:
#y=-670#
Check by putting it back in:
#21=|-670+685|+6#
Solve absolute value bars first:
#21=|15|+6#
Then Solve:
#21=21#
Works