MATH152/April 2015/Question B 3 (c)

Hi Brian,

I think it would be great if you write more precisely. For example, in MATH152/April 2015/Question B 3 (c), instead of saying that

$P_{1}=....$, $P_{2}=.....$, so $P_{1}=P_{2}$, (because here P_1 is notation for plane, so the expression P_1 = ... doesn't make sense. So is $P_{1}=P_{2}$.)

we can introduce a point ${\mathbf {x}}$ on the line $l_{2}$. (See the details in the solution. I corrected it :) )

Also, can you write more details for the Gaussian elimination part in the solution of MATH152/April 2015/Question B 3 (c)?

Thanks a lot in advance.

Moreover, the solution is incorrect. The line Brian gives does not lie in $P_{2}$.