What is the property of the first step in the equation?

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  (c)  addition property of equality

Step-by-step explanation:

Each side of the equation after the first step is 2 more than it was before the first step. The first step consisted of adding 2 to both sides of the equation.

The "addition property of equality" tells you that the value of the variable remains unchanged if you add the same thing to both sides of the equation. That is, the addition property of equality justifies the fist step of adding 2 to both sides of the equation.

i would say the third one.

step-by-step explanation: liner would mean in a line and the only one that doesn't look like it's even thinking about forming a line would be the third one