Getting very stuck on solving these, ive tried using substitution but i dont know how to rearrange it...
can you help?
to rearrange for in the first equation, you can substract then multiply by . So you find :
Setting to make it a bit simpler, we are left with :
Substituting back the value we chose for , we get :
Finding the value of is now straightforward
Does it make sense ? Remember not to get stopped by impressive square roots and stuff : as long as there are no terms in them, they can be considered a constant (and thus substituted to some letter, in my example)