book Maths Puzzle Numerical Ability

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

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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
Can you graph these functions:

(1) V = 4x^3 - 28x^2 + 48x
(2) h = 7.96cm

Can you graph these coordinates:
(0, 1), (1, 1.1), (2, 1.21), (3, 1.331), (4, 1.4641)

Thank y