Book Maths Puzzle Algebra

How do you solve this equation? Given that equations (a) x + 2y = 5 and equation (b) is x = 3y, solve the system of equations by substitution. How would I Graph the equations? Ho

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Trying to solve the following:
x3-12x2+44x-48=0


(thats x cubed, 12 x square, 44x, -48)


Thanks Hi can someone help me with determining the equation of the quadratic function

with a vertex of (3,5) and point (5,1)



and a parabola with the points (-1,4), (1, -2) and (2,1)



Thanks!