Math really miss her, huh?

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Across
  1. 1. The missing value of joint variation
  2. 5. Equation of direct variation
  3. 6. General equation of combined equation
  4. 7. Inverse Equation
  5. 8. The third equation in direct and inverse. Which we need to find the
  6. 12. A quantity varies jointly as two or more varbles.
  7. 13. A term found in almost of the variations
  8. 14. Second equation of joint variation
  9. 18. General equation of joint variation
  10. 19. Quotient of constant two variables(x,y) is a constant
  11. 20. Mathematical statement to inequalities
Down
  1. 2. Third equaion of joint variation
  2. 3. Standard form of quadratic functions
  3. 4. Constant variation of inverse variation
  4. 8. The middle of the parabola
  5. 9. Constant of joint variation
  6. 10. The variations relating the quantities
  7. 11. A variation that one quantity increases and the other decreases
  8. 15. Formula for finding constant in direct variation
  9. 16. Vertex Form
  10. 17. Third step in solving quadratics inequalities