how do you do formulae?
for example it says make x the subject and the formulae is like:
2=y-4x
i get really confused with questions like that
Do it step by step.
$\displaystyle 2 = y - 4x$
Take the other variable to one side so you only have the variable that you want to make the subject on one side. In this case $\displaystyle y$ is the other variable so we'll move it to the LHS.
$\displaystyle 2-y=-4x$
Divide by the number in front of the variable that you want to make the subject. In this case $\displaystyle -4$.
$\displaystyle -\frac{2-y}{4} = x$