book Maths Puzzle Numerical Ability

y=2x+8

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book Other Question

hi i need help for this equation and how to to arrive at the answer.

solve (find values) for A, B, C, D, F

(x^4 - 4x^2 - 7x - 28) = A(x^B + C)(x^D - F) The graph of x-4y+8=0 crosses the y-axis at y= what?