Question

which step could be used to help isolate the variable in the following equation? 5.6j - 0.12 = 4 + 1.1j subtract 0.12 from both sides. subtract 5.6 from both sides. subtract 4j from both sides. subtract 1.1j from both sides.

Explanation:

Step1: Recall equation - solving goal

To isolate the variable $j$, we want to get all terms with $j$ on one - side.

Step2: Analyze each option

Subtracting 0.12 from both sides will not help in isolating $j$. Subtracting 5.6 from both sides is incorrect as we don't want to get rid of the coefficient of $j$ in that way. Subtracting $4j$ from both sides is wrong as there is no $4j$ term in the original equation. Subtracting $1.1j$ from both sides will move the $j$ terms to one side:
\[5.6j-0.12-(1.1j)=4 + 1.1j-(1.1j)\]
\[5.6j-1.1j-0.12=4\]
\[4.5j-0.12 = 4\]

Answer:

Subtract 1.1j from both sides.