The normal way i've been calculating slope is via 'the rise over the run' - i.e slope = changeinY/changeinX
for budget constraints, the textbook lists the slope as being
slope = -price of good X/price of good Y
in the one example I have, the two different calculations of the slope yield the same answer..soo i was wondering whether they always gave the same answer or whether this was just a concidence?
it also gives another formula,
changeinX = (changeinY x price of good Y)/ price of good X
i was wondering how this formula gave the change in X? is there some simple algebra behind it that proves it that i'm missing?
Should I still go?