Math really miss her, huh?

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