book Maths Puzzle Numerical Ability

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

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prob. 94 The cost for a long distance phone call is 0.46 for the first minute,and 0.21 for additional minute or portion thereof.Write an inequality representing the number of minutes a person could talk without exceeding 3.00 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
?