book Maths Puzzle Numerical Ability

Hi, please help!

I am trying to solve the system of linear inequalities by graphing, however, I cannot locate an example on this problem:

x + 2y is less than or equal to 3
2

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(-10p)(-8q)(-r) The curve y=ax^2 +bx+c passes through the points (x1,y1), (x2,y2), and (x3,y3). Show that the coefficients a, b, and c are a solution of the system of linear equations whose augme