What's "the output is the cube of the input"

X+ y = k 2x + 3y = k + 1 the point of intersection of the lines has an x-coordinate of a.2k + 1 b.-2k + 1 c.2k - 1

Find the roots of the equation below. x^2 - 6 + 9 = 0

What dimensions can créate more than one triangle ?