exam Maths Puzzle Numerical Ability

can someone PLEASE help me solve this system:
{ x+ y-4z=6
{2x-5y+3z=2
{ x-6y+7z=-4
thank you so much!

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exam Other Question

Two surveyors with two-way radios leave the same point at 9:00 A.M., one walking due south at 4 mi/hr. How long can they communicate with one another if each radio has a maximum range of 2 miles? Solve: square root of 2y-3 = 3

Please show work and solution.