book Maths Puzzle Numerical Ability

please help me with this problem
solve for x

x=3/x+1

this is what i have so far
x(x+1)=3
(x+3)(x-1)=0
?

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book Other Question

Find the area of the triangle bounded by the lines x=2, y=3 and 8x+5y=40.
please help i really dont know whow to do this.thanks What is the slope of the points (4,2) (-5,2)

i got 0/-9.. do i leave it that way or is the slope 0??

Thanks Caroline