exam Maths Puzzle Numerical Ability

A line L through the origin in R^3 can be represented by parametrix equations of the form x = at, y = bt, z = ct. Use these equations to show that L is a subspace of R^3; that is

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exam Other Question
4n + 1 <9

x/2 + 9<11

5 < m/8 + 5

8k - 3 > -27

9(x+3)= 4x - 3

I do not understand how to do these problems. I had gotten no directions. If possible, could yo Factor completely:

27x3 - 8y3

Hint: use the “difference of two cubes method”