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Oliver Schick
Maths buffs, some help please. Really basic one, my girlfriend came to me with an equation "rearrange y=ax+7 to make x the subject".
I said -7 from both side (y-7=ax) then divide both by 'a' (y-7/a=x) which I think is right. But a colleague initially said he would divide by 'a' first. I said no because you'd end up with (y/a=x+7/a)
1) is that all correct
2) am I right in thinking if you divide on one side, you need to do the same to each +/- element seperately on the other
3) is there a name for this principle?