7. Determine the intersection, if any, of the planes with equations x +y-z + 12 =0 and 2x + 4y - 3z + 8 = 0 8. Solve the following system of equations and give a geometrical interpretation of the result. x+y+z=6 2x+y-3z=-5 4x - 5y+z=-3 9. Give a geometrical interpretation of the intersection of the planes with equations x+y-3=0 y+z+5=0 X+2+2=0 10 Determine a scalar enuation for the plane that nacene throunh the point 120

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