Find the equation of tangent plane to z=3x2−xyz=3x2−xy at point (1,2,1)(1,2,1) a.
3x−y−z=−13x−y−z=−1

b.
4x−y+z=14x−y+z=1

c.
4x+y−z=14x+y−z=1

d.
4x−y−z=1

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?

Through non-collinear points there is exactly one plane.