Question

Can someone please explain to me what the "subtraction property of equality" is?

I know what the transitive property of equality is: if a = b, and b = c, then a = c.

So for example I have a problem i'm working on where I'm proving vertical angles are congruent. I've already narrowed everything down to transitive property of equality: Angle 1 + Angle 4 = Angle 3 + Angle 4. Using the subtraction property of equality will be my final step in proving congruency, but I don't know what or how to use this property. Help please?

Answer 1

It means that when both sides of an equation have the same number subtracted from them the remaining expressions are equal.                                                                                                                ( ......Hope that I helped you...... )
                                                                                    

Answer 2

the subtraction property of equality means that
a=b and c=d then a-c=b-d or
a=b and c=c, then a-c=b-c
basically when 2 things are equal, and you subtract the same value from both sides, the equation remains equal

or
a+c=b=c simlifies to a=b where you can simlify the same thing from both sides and retain the equality