Do not repeat numbers on either side of the mapping; if a domain has more than one range, it is not a function.

The equation must not include exponents, variables in the denominators or fractions, or x and y being multiplied together.

To graph the new equation, make a function table with the domain and range. Give x the value of zero and see, according to the equation, what this makes y. Do the same thing with y as zero and then graph the points. If it makes all the numbers zero, substitute one of the zeroes with 1.

Ax + By = C

1. The lead coefficient can't be negative.2. Neither the coefficient nor the constant can be a fraction.3. The equation must be in Ax + By = C form.4. Any coefficients and constants must be simplified.