Answer: B) Subtraction property of equality.
Step-by-step explanation:
Given the equation [tex]x+5=15[/tex], you need to solve for x to find its value. Then, you need to subtract 5 from both sides of the equation.
This property is called "Subtraction property of equality" and states that, to keep the equation balanced, if you subtract a number from one side of the equation, you must subtract the same number from the other side:
If:
[tex]a=b[/tex]
Then:
[tex]a-c=b-c[/tex]
Applying this property:
[tex]x+5-(5)=15-(5)\\x=10[/tex]