What is the most efficient first step to isolate the variable term on one side of this equation? -9x = -4x + 5 A. Subtract 5 fro
m both sides. B. Add 5 to both sides. C. Subtract 9x from both sides. D. Add 4x to both sides.
2 answers:
<u>Answer</u>
D. Add 4x to both sides.
<u>Explanation</u>
-9x = -4x + 5
On the right hand side we have -4x. We have to add 4x on both sides to have;
-9x + 4x= -4x + 5 + 4x
(-4x + 4x = 0)
(-9x + 4x = -5x)
∴ -5x = 5
For this case we have the following equation:

We want to clear x:
For this we must follow a series of steps, the first consists of adding 4x to both sides of the equation to obtain:

In this way, the variable term remains on one side of the equation.
Thus, the first step will be:
Add 4x to both sides
Answer:
Option D
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