- #1

Ziggletooth

- 5

- 0

I had this question

plot a graph using y = 2/3x

The answer is:

if x = 3

y = (2/3 * 3) = 2

x = 3, y = 2

and these are integers which can be plotted very easily on the graph.

I got confused and did this

y = 2/3x

(y * 3) = (2/3x * 3)

3y = 2x

(3y / 2) = (2x / 2)

x = 1.5y

Obviously this is very wrong (if x = 3, y = 4.5 which is != 2 as above), but I'm not sure why. This is an equation isn't it? and those are the sort of balancing things you do to solve equations, so why has it gone so horribly wrong?