Question 53415
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This question is from textbook Prentice Hall Mathematics Algebra 1
What is -y + 10 = 25? I did:
-y + 10 = 25
-25 -25
-y = -15
-1(-y) = -1(-15)
y = 15
Am I right?
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        You are wrong.


        The answer in the post by @consc198 is WRONG, too.


        For correct solution see what follows.



Your starting equation is


        -y + 10 = 25.


Move -y from left side to right side changing the sign


        10 = 25 + y.


Move 25 from right side to left side changing the sign


        10 - 25 = y.


Combine like terms in left side


        -15 = y.


So, your answer is     y = -15.



Solved correctly and completely to the end, with detailed explanations.