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# 7-y=4 ? Watch

1. Sorry if this is super obvious, but I have a number of algebra questions to solve. I know if the question was y-7=4 you'd simply add 7 to both sides, but can you do the same if it's 7-y? If not, can someone talk me through this please?
2. Add y to both sides then see what happens
3. There are several ways to solve this. Let's try one.

7 - Y = 4

try adding y to both sides.

in that case you get

7 - y + y = 4 + y

the ys cancel and you are left with 7 = 4 +y

minus 4 from both sides...
you get
y = 3

make sense?
4. (Original post by Law-Hopeful)
Add y to both sides then see what happens
7-y = 4
7= 4 + y
3 = + y
y = 3

Like so? Sorry no maths for a few weeks has shrunk my brain it seems ! :P
5. (Original post by Temporality)
There are several ways to solve this. Let's try one.

make sense?
Yes, thank you so much!
6. (Original post by Winterfellrises)
7-y = 4
7= 4 + y
3 = + y
y = 3

Like so? Sorry no maths for a few weeks has shrunk my brain it seems ! :P
That's right.
7. oh my god I miss GCSEs so much.
8. If it was 7-y=4 (think of it as -y+7=4)

The you would need to eliminate the +7 so you would subtract -7 from both side so -y=-3 and y=3.

An alternative way of managing the numbers is to move the numbers across the equals sign so you end up with y=… and when you move a number or letter over you change the sign so a +7 becomes a -7 when you move it across.
9. Is it not just blindingly obvious that if you start with 7, end with 4, and you had to take a value (y) away to get there, then it's clearly 3?

Although I guess you may need to show working of some sort, and in any case I haven't done algebra for 7 years
10. Just thought I'd say to the sarcastic comments, I'm not actually a GCSE student, I just posted here because I know it's GCSE material.
11. If you can't answer that question your to young to be watching game of thrones OP

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Updated: July 11, 2014
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