exam Maths Puzzle Numerical Ability

Find the greatest common factor for each of the following sets of terms.

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

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exam Other Question

Graph: (a) y=2 (b) y=2x

The book has the answer at y = 3/5X+26/3

I can not get this answer no matter how I graph it. It is like some of the problem is missing.
Solve the System:

2x-y+2z=11
3x-2y-z=12
x-3y-z=1