Originally Posted by

**He-Mann**
Do it yourself, mate.

You're too worried about how to do these questions and whether it's something that you need to learn rather than exercising your problem solving skills.

Here I demonstrate Q3 (a), which you CAN do.

What is the structure of a cartesian equation in R3? ax+by+cz=d, where a, b, c, d are known constants. So, you need (x, y, z).

Where do you get (x, y, z) from what you have?

r = (x, y, z) = (1,1,1) + s(1,0,1) + t(0,2,2)

So, x = __, y = __, z = __.

You're nearly done but the problem here is you figure it out? Which is easily solved with your knowledge.

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