exam Maths Puzzle Numerical Ability

Solve the system by substitution.
x - 4y = -9
2x + 2y = 12
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exam Other Question

find an equation with coefficients whose roots are 2 plus and minus the square root of 3 divided by 3 If X-3 is a factor of X^4-3X^3+KX+3, what is the value of K?