Hey guys , i've pinpointed certain areas in the maths that i have weaknesses in so here are just a few question before next weeks final , i wanted to clarify wondering if you guys can solve for me asap |:0)

Now here's a Simultaneous Equation And Just a quick question ( when using the elimination method , which i use ) how can you tell when to add or subtract?

2x - 3y = 2

3x - 2y = -(7)

Also , i believe this is quadratics...

{ X^2 - 6x + 1 = 0 }

I am also trying to factorize

4x^2-5+1

and simplify lastly

4(x-1) -3(2x+1) = 3(x+4)

Anyhelp would be nice... These littler things tend to mess me up and i end up spending more time than i should on them.