That the sum of a number and zero is the original number.

The variable in a relation who’s value depends on the value of the independent variable is called what?

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?