Need in math
how does the slope of the line y=-x affect the graph?

instructions says :
think about how the graph changed as a result of changing the slope to a negative. write several complete grammatically correct sentences describing how changing the slope to a negative number changes the graph. be specific and detailed.
you. i will really appreciate that

When you change a slope from positive to negative, it flips because it goes from being an increasing slope to a decreasing slope. negative slopes decrease as they move from left to right; positive slopes increase from left to right. in the case of y = x, which is line directly through the origin, this line is steadily increasing from the bottom left corner to the top of the right corner of a graph. when you change the slope from 1 to -1, the graph instead declines from the top left to the bottom right. 

The answer is: y would equal 3 because if you simplify the equation then it would be y= 3x+9 and if you divide 3x and 9 by 3 it would equal 3. y= 3

It’s d for sure i just did also that’s why