for question 1
2x - y - 4 = 0
y= 2x -4 (1)
y=x^2 / 4 (2)
substituting 1 into 2
2x - 4 = x^2 /4
therefore, x^2 = 8x -16
x^2 - 8x + 16 = 0
(x - 4)(x - 4) = 0
x = 4
therefore, y = 2(4) -4
= 4
hence A (4,4 )
i think,
soz dont hav time to help with other questions atm, im sure other helpful...