exam Maths Puzzle Numerical Ability

solve each systems of equations algebraically

38. -3x+12y=6
2x-8y=6

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exam Other Question

My question is if the vertex of f(x)=-x^2+bx+8 has y-coordinate 17 and is in the second quadrant, find b. F(t)=t^2+4t
-Determine the domain of each function.