book Maths Puzzle Numerical Ability

4-6(3x-1)<5x+2

4-18x+6<5x+2
-5x -5x
4-13x+6<2
-4 -4

-13x+6<-2
-6 -6
-13x<-8
_______
-13x -13x

x=8/13

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I am doing solving systems by graphing and substitution. The problem is:
5x + 4y = 7
x - 3y = 9
I have to choose the right graph and show how I got the answer. I have no idea i need help on proprties and area of quadrilaterals; my question is how to find the measure of an interior angle and exterior angle of any regular nonagon