exam Maths Puzzle Numerical Ability

I need to write a power function in form of y=ax^b passing through points (2,3)(6,7). This is what I've got so far:3=a*2^b a=3/2^b and 7=a*6^b

Then I've got 7/3 =3/2^b *6b. N

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instuctions-solve each system by the graphing method.

this makes no sense and the problem is stright out of the book

y=x
y=6-x prove that the sum of the angles of any quadrilateral is 360 degrees.

does it have to do with the expression: (n-2)180
where n is the number of sides?