Question

Not too sure how these work, they’re absolute value equations.

Answer 1

Recall that if

$|a|=b,$

then,

$a=-b\text{ or a=b.}$

Therefore, if

$|2.5x-6.8|=12.9$

then,

$2.5x-6.8=12.9\text{ or }2.5x-6.8=-12.9.$

Answer:

Negative case:

$2.5x-6.8=-12.9$

Positive case:

$2.5x-6.8=12.9$