exam Maths Puzzle Numerical Ability

How do you determine whether to draw the boundary line of the graph of a linear inequality dashed or solid

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exam Other Question

2x + y - z = -5
x - 3y + 2z = 5
2x + 4y - 2z = -8

solve the following system of equations in three variables
Could I get some help with this problem.

Find the greatest common factor for the following set of terms,

12a^3b^2, 18a^2b^3, 6a^4b^b.

Thank you for your help.