Math really miss her, huh?

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