It is called an equation. That is, it is a statement that says that if you start with a certain number (which we agree to call 'y') and add 3 to it, the result will equal 10.
Can you guess what that number is?
That's right - the number is seven! If you start with any other number, besides seven, and add three to it, you won't get ten; you will get something else, instead. So, the number you start with has got to be seven.
That is what we call the solution, the result we get when we solve the equation. This means that, when we let y = 7, the statement that y + 3 = 10 turns out to be a true statement.
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y=10
The answer is y+3-3=7+3 y=10.
a = 3 and y = 0
Well what does y equal? If y equals 7 the 3+7=10
10-y=2y+3 10-3=2y+y 7=3y 7/3=y