exam Maths Puzzle Numerical Ability

solve:

-2*x+3*y+z=20
7*x-5*y+3*z=-35
4*x+4*y+4*z=12

this is listed as one problem on my math sheet:)Thanks again for the help!!
Chris

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exam Other Question
At a college, there are 170 faculty members and 4823 students. Find the faculty-to-student ratio. Solve the given equation using synthetic division, given the roots indicated

4x^4 + 28x^3 + 61x^2 + 42x + 9 = 0 (-3 is a double root)