book Maths Puzzle Numerical Ability

Solve the system of equations and state if it has no solution or infinite solutions

x-y-2z=3
x-2y+z=1
3y+3z=-2

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book Other Question

8 4
_ _
b+10 2b-7

im having big trouble on this question and i hope i can get some help CAN SOMEONE TEACH ME HOW TO DO LINEAR INEQUALITIES?
like - how do i find a boundry of a line?
ex. y>x y=____