exam Maths Puzzle Numerical Ability

is this a linear equation y-4x=9 explain

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exam Other Question

s^2 + 2s - 8/s^2 + 3s - 10 * s + 5/ s^2 - 16 Hey!..can u please help me with this problem?..it has to be factored completely.

8b^2+12b+4

thanks!