Inequality
not equal, more than, less than, not the same
Inequality Symbols
> greater than, < less than, ≥ greater than or equal to, ≤ less than or equal to
Infinite
Extending to infinity or indefinitely
Integer
Positive and negative whole numbers including zeros. This category does not include any fractions or decimals.
Examples: –2, 0, 4
Intercept
Where the line you are graphing intersects the axes of the coordinate plane
Intersection
The intersection of two or more sets is made up of the elements that the sets share. The term intersection is represented using an upside down union symbol which looks like 
.
Irrational Number
A number that cannot be expressed as a ratio (fraction) of two numbers. This includes decimals that never stop or repeat.
Examples: 
, 3.2516...
Isolate
To separate out from all other parts. When solving an equation and isolating the variable, the variable is on one side of the equal sign and everything else on the other side. Separate the variable from the other variables and numbers using the equal sign as the border.
