Semester two math formulas

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Across
  1. 2. perpendicular sides of triangles
  2. 3. do this to a fraction to make it count for an answer
  3. 5. unknown number in an equation
  4. 6. y-y1=(m)x-x1
  5. 7. one event relies on a past event
  6. 8. y=m(x)+b
Down
  1. 1. a^2+b^2=c^2
  2. 3. ax+by=c
  3. 4. y2-y1/x2-x1