book Maths Puzzle Numerical Ability

8 4
_ _
b+10 2b-7

im having big trouble on this question and i hope i can get some help

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book Other Question

A worker at a tile store needs to replace a bathroom floor. She wants to use only one shape of tile to cover the floor. Which shape tile will NOT cover the floor without leaving 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