exam Maths Puzzle Numerical Ability

2x + 3y = 1
5x + 3y = 16
x = ?
y = ?

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exam Other Question

Use the Factor Theorem to determine whether x - c is a factor of the following function. Write in the form f ( x ) = (x - c) (quotient) if f( x ) = -4x^3 + 5x^2 + 8; c = -2 sin75 degree=?