Posted by **chchch** on Saturday, July 14, 2012 at 12:56pm.

Need help with domain and range

how do you find the domain and range of

y=x+8.

after that one how do you find the domain and range of 7x+y=1

- Math -
**Steve**, Saturday, July 14, 2012 at 2:37pm
the domain of all polynomials is all real numbers

the range of all linear equations (with nonzero slope) is all real numbers.

Think about it. You have a straight line that extends all the way in both directions. Assuming it is not horizontal, then there is no value for either x or y that does not have a point on the line.

- Math -
**chchch**, Saturday, July 14, 2012 at 4:18pm
but how do you know if an equation is a straight line or not

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