Math really miss her, huh?

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