algebra puzzle

1234567
Across
  1. 3. part of the coordinate plane where all ordered pairs are solutions
  2. 5. ordered list of numbers that follow a set rule or pattern
  3. 7. solve 1 equation for a variable and then plug that value into the other equation.
Down
  1. 1. a value that multiplies by itself twice to give the original number
  2. 2. the total amount resulting from addition of two or more numbers amounts, or items.
  3. 3. rate of change between 2 points on a line, measures the steepness
  4. 4. rising or falling at a sharp angle. The bigger the number in slope , the steeper the line.
  5. 6. graph with plotted points to show possible relationships.