Quadratic Simultaneous Equations

Question 1:

y=2x22x+2 y=2x+8
x=3 or -1 y=14 or 6

Question 2:

y=x2+8x5 y=2x2
x=0.464 or -6.46 y=-1.072 or -14.92

Question 3:

y=2x2+15x7 y=x9
x=-0.146 or -6.85 y=-9.146 or -15.85

Question 4:

y=x2+11x1 y=2x+3
x=0.424 or -9.42 y=3.848 or -15.84

Question 5:

y=3x24x2 y=2x3
x=1.82 or 0.184 y=0.64 or -2.632

Question 6:

y=2x2+9x+2 y=x+9
x=0.739 or -4.74 y=9.739 or 4.26