Question

Please help! 20 Points.

Answer 1

Answer:

Distributive Property

Step-by-step explanation:

From what I saw, the student distributed 2 from the first line into x and 2 from the first line into -10 for the equation to result in the second line.

Answer 2

The property used in line A is the commutative property

This is the idea of adding can be done in any order, eg: 2+3 = 3+2 = 5

For this problem, 2x-20+x turns into 2x+x-20. Think of 2x-20 as 2x+(-20).

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The property you would use after line B is the addition property of equality

This rule says that if a = b, then a+c = b+c. In words: we can add any number to both sides of any equation. In this case, we would add 20 to both sides to undo the "-20" on the left side.