exam Maths Puzzle Numerical Ability

i need to solve -2x+y+z=-2
5x+3y+3z=71
4x-2y-3z=1

i have to solve for x,y, and z PLEASE HELP!!!!

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Please help solve compound or absolute value inequality and show graph and solution set Thanks!

3x - 9 > 6 or -3x is greater than or equal to -9 There were 150 tickets sold for a school play. tickets for students were $2.00 and adults $3.00. the total amount of money made was $150. how many more student tickets were sold than adult? what equation(s) couldja make for this? using x and/or y??