When attempting to do his/her homework, a student uses the addition property of equality to solve for a below. Which statement BEST applies to the sample below?

a + 3 = 9
a + 3 – 3 = 9 – 9
a = 0
A.
The student failed to keep both sides of the equation balanced.
B.
The student’s final answer does not have the variable a isolated.
C.
The use of the addition property of equality is sound, and the answer is correct.
D.
The student should have added 3 to the left side of the equation rather than subtracting.

Question

When attempting to do his/her homework, a student uses the addition property of equality to solve for a below. Which statement BEST applies to the sample below?

a + 3 = 9
a + 3 – 3 = 9 – 9
a = 0
A.
The student failed to keep both sides of the equation balanced.
B.
The student’s final answer does not have the variable a isolated.
C.
The use of the addition property of equality is sound, and the answer is correct.
D.
The student should have added 3 to the left side of the equation rather than subtracting.

anonymous · Answer

Ehm. is there an error in the way to solve the equation?

anonymous · Answer

No that is how the question is written

anonymous · Answer

No, i mean here is how they show you the supposed method:
a+3=9
a+3+(-3)=9+(-9)
Is that okay? (With your mathematical knowledge)

anonymous · Answer

No I find it invalid for them to do that. I was confused like crazy that is why I asked for help

anonymous · Answer

Yeah, exactly, is invalid.
Now, the question is which answer describes the situation at best.
Analyze each case.
Then you'll see that only one matches the problem.

anonymous · Answer

Ok thank you Umangiased

anonymous · Answer

No problem ;)