Answer:
Addition Property of Equality
Step-by-step explanation:
The addition property of equality says that;
[tex]a=b[/tex]
is equivalent to
[tex]a+c=b+c[/tex]
The given equation is [tex]\frac{3}{4}x-6+6=-9+6[/tex]
We can observe that, 6 was added to both sides of
[tex]\frac{3}{4}x-6=-9[/tex] to obtain [tex]\frac{3}{4}x-6+6=-9+6[/tex].
Therefore the property use here is the addition property of equality.
