Across
1
Proven mathematical statement
2
Steepness of a line
5
Reference line in a graph
6
Divisible by two
7
Line touching circle at one point
8
Closed shape with straight sides
10
Mathematical rule or equation
Down
2
System of ordered marks for measuring
3
Symbol representing unknown value
4
Number less than zero
7
Three-sided polygon
9
Difference between highest and lowest values