exam Maths Puzzle Numerical Ability

x+2y+5z=-1
2x-y+z=2
3x+4y-4z=14

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exam Other Question

What would the graph of the quadratic function with zeros 1/2 plus or minus sqrt7/3 look like ? Please help me solve this question.

Find the equation of the line joining A(-1, -9)to B(6, 12)

Another line passes through C(7, -5) and meets AB at right angle at D. Find the equation of CD and calculate the coordinates of D.