What happens to the equation when y = x becomes y = -x?

What is x and y intercepts for y=x+7

Mis the midpoint of rq if rm equals 2x + 5 and mq equals 4x - 9 what is the length of rq

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?