Which functions have a positive rate of change and which have a negative rate of change?

http://prntscr.com/5cs4mz

@iGreen @Directrix @Callisto @Loser66

Question

Which functions have a positive rate of change and which have a negative rate of change? 

http://prntscr.com/5cs4mz

@iGreen @Directrix @Callisto @Loser66

igreen · Answer

Rearrange 2x - 3y = 9.

Subtract 2x to both sides:

-3y = -2x + 9

Divide -3 to all terms:

y = 2/3x - 3

Okay, now it's in the form of y = mx + b, where m is the slope..so what's the slope of y = 2/3x - 3? @iRespect

anonymous · Answer

$$m = \frac{ 2 }{ 3 }$$

igreen · Answer

Yep, and is that positive or negative?

anonymous · Answer

Positive

igreen · Answer

Yep, so 2x - 3y = 9 has a positive slope.

igreen · Answer

What's the slope of y = -4x + 5?

anonymous · Answer

$$m = -4$$Negative

igreen · Answer

Yep, so y = -4x + 5 has a negative slope.

anonymous · Answer

m = 3 for the next one?

igreen · Answer

Here are the graphs for the two tables. Are they positive or negative? https://www.desmos.com/calculator/dezbscdtbh

anonymous · Answer

1) Positive 
2) Negative

igreen · Answer

Yep, so for #3 it's Positive, and #4 is Negative.

anonymous · Answer

Could you help with a few more?