Answer:
Option 1
Explanation:
Given is an equation in one variable x.
It is as follows:
-5.4+x=12.2
To solve for x, we must make left side only with x and eliminate -5.4
For this only way is to add 5.4 to both the sides of the equation without affecting the equality.
When we add 5.4 to both sides -5.4 gets cancelled with 5.4 and make left side only x
-5.4+x=12.2
+5.4 5.4
------------------
x =17.6
Thus we get answer correctly as 17.6
Kaitlin instead subtracted 5.4 from both the sides which made the equation
as
-10.8+x=6.8
Thus her answer 6.8 is incorrect