exam Maths Puzzle Numerical Ability

solve the system, thanks
y-3z=-12
-2x+y+2z=5
2x+3z=7

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hI can anyone help me with this?

You are part of a panel of parents, teachers, and administrators working to revise the geometry curriculum for the local high school. On tonight what is the equation in the standard form of the line through (4,1) and (-2,3)?