Which property of equality would be used to isolate the variable a in this equation?

a – 4 = 12
A.
addition property of equality
B.
subtraction property of equality
C.
multiplication property of equality
D.
division property of equality

Question

Which property of equality would be used to isolate the variable a in this equation?

a – 4 = 12
A.
addition property of equality
B.
subtraction property of equality
C.
multiplication property of equality
D.
division property of equality

anonymous · Answer

So your goal is to have a by itself on one side of the equation. How do you get rid of the -4?

anonymous · Answer

to have the variable 'a' by itself.

anonymous · Answer

oh :oo You add it?

anonymous · Answer

So let's see.

a - 4 + 4 = 12 + 4

mathmale · Answer

Yes.  And, given that you're to use a "property of equality," think:  "If equals are added to equals, the sums are equal."

anonymous · Answer

a = 16

mathmale · Answer

So, you begin with an equation (equals) and add equals (4 and 4) to both sides, and end up with a new statement which is also true / is also an equation.