exam Maths Puzzle Numerical Ability

Solve the system of equations algebrically.
Eliminate the z variable.

2x-y+4z=-2
3x-2y-z=-3
x+4y+2z=17

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exam Other Question
Can someone help me graph the following problem? I am lost.

Solve the system by graphing:

3x + y = 6
3x - y = 0

Thank you,
Ashley A tour-bus goes 90 miles to its destination. The rate returning is twice as fast as going. The time for a round trip is 3 hours. How fast does the tour-bus go on each part of the trip?