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linear function
y=ax+b where a and b are constant numbers.

direct variation
y=ax where a is a fixed number other than 0.

In direct variation, if x is doubled...
...so is y.

The graph of every _______ is a straight line that intersects the origin.
direct variation

Direct variation is a type of _______.
linear function

inverse variation
y=a/x where a is a constant number other than zero.

The graph of every inverse variation is a _______.
curve

rational number
Any number that can be written as the quotient of two integers.

The sum of two numbers having the same sign can be found by...
... adding their absolute values, the answer having the same sign as the numbers.

The sum of two numbers having opposite signs can be found by...
...subtracting their absolute values, the answer having the same sign as the number having the larger absolute value.

Subtracting a number is equivalent to...
adding its opposite.

The product or quotient of two numbers having the same sign can be found by...
...multiplying or dividing their absolute values, the answer always being positive.

The product or quotient of two numbers having opposite signs can be found by...
...multiplying or dividing their absolute values, the answer always being negative.

When approximating, if a number is exactly midway between two numbers that might be used as approximations of it, we chose the number that is...
...farthest from zero on the line.

