googoomylizard
27.11.2020 •
Mathematics
What is the justification for the step taken from line 2 to line 3?
3x +9-7X=X+10+X
-4x+9 = 2x+10
-6x+9= 10
-6x=1
x = 6 음
(A) the subtraction property of equality
(B) the multiplication property of equality
(C) combining like terms on one side of the equation
(D) the distributive property
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Ответ:
(A) the subtraction property of equality
Step-by-step explanation:
Given
The steps in the question
Require
Justify step 2 to 3
Write out step 2:
Apply subtraction property by subtracting 2x from both sides
Notice that the above equation is represented in step 3.
Hence, option A answers the question.
Ответ: