Add maths

• (y - y1) = m (x - x1) straight line graph
• Discriminant - determines how many real solutions / roots in a quadratic equation
• Reciprocal graph

  A) negative

  B) -1/x

  
• Reciprocal graph

  A) positive

  B) 1/x

  
• Reciprocal graph

  A) 1/x^2

  
• Reciprocal graph

  A) -1/x^2