Math Is Fun Forum

URGENT
i know the answers to all of the following but do not know how to get the answer, each of them include simultaneous equations and the quadratic equation:

a)
x-y+1=0 and 3x^2-4y=0
the answer is 2,3 or -2/3, 1/3

b)
x^2+xy=8 and x-y=6
the answer is 4,-2 or -1,-7

c)
2x-y+3=0 and y^2-5x^2=20
the answer is 1,5 or 11,25

d)
x=2y and x^2-y^2+xy=20
the answer is 4,2 or -4,-2

e)
x+2y=-3 and x^2-2x+3y^2=11
the answer is 1,-2 or -2 3/2, -2/7

NEED URGENT HELP!!!!
no explanation needed.... will figure it out myself, just layout the working out please

thanks before hand!