- 6a-3b Factorize not sure what i am doing here?

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Can any one graph y=-2x+4 using x and y intercept? 2/3y - 3x = -6
Find x y equals 9? How would I sketch f(x,y) = x^2 + 9y^2 on the xy plane? I know it is a circle.? Find a basis of the subspace of R4 that consists of all vectors perpendicular to both [1,0,0,7] and [0,1,-9,5]. Please show work!? Controversial question of the day: Should people have the right to die?