Step by step
The question
Question: find the value of 7 − y when y = 7.
7 − y
y = 7
1 Put the numbers in
We put 7 in place of y.
= 7 − 7
2 Take away
7 minus 7 is 0.
= 0
So 7 − y is 0 when y = 7.
Let's look back.
First: put the numbers in.
Last: take away.
Answer
= 0