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Step 1: Factorise the equation either directly or by using the quadratic formulae {[-b(+/-)sqrt(b^2-4ac)]/2a}. This equation can be factorised directly since 3*3=9 (for the last term on the RHS) and 3+3=6...

 y=x(x−1)y= x^2-xdy/dx= 2x-1

Atoms of the same element with different numbers of neutrons 

The movement of molecules against their concentration gradient (low concentration to high concentration), across a membrane using energy.

Example solve the following, equation 1: x²+2y=9 equation 2: y=x+3In this example we have to use substitution, therefore we sub in equation 2 into 1 to get the following x²+2(x+3)=9 ...