exam Maths Puzzle Numerical Ability

reduce to lowest terms 3bcubed over 3b+3

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exam Other Question

Can someone help me on this?
I need to find the LCM for 4 and 20. (Least common multiples)

Thanks,
Ashley

HOW DO YOU GRAPH THE LINE THAT PASSES THROUGH THE (1,1) (3,3)
AND THEN WRITE THE EQUATION OF EACH LINE?