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

2x – 3y = 9

A.
positive
B.
negative

Question

Which functions have a positive rate of change and which have a negative rate of change?

2x – 3y = 9

A.
positive
B.
negative

susanna · Answer

put it in y=mx+b form

susanna · Answer

2x-3y=9
move 2x to the other side - it becomes negative.
-3y=-2x+9
divide both sides by -3
$$y =\frac{ 2 }{ 3 }x-3$$

cal.lavender · Answer

Do you know what rate of change is equal to?

anonymous · Answer

i think so. been a while since i actually did it doe

susanna · Answer

slope is positive, so the rate of change is positive

cal.lavender · Answer

It is equal to slope as she said

anonymous · Answer

ah. okay good

anonymous · Answer

y = −4x + 5

positive or negative

susanna · Answer

slope is negative, so....

anonymous · Answer

yeah was thinkig the same

anonymous · Answer

x	y
−1	−5
1	1
3	7


think this one is negative too

susanna · Answer

find the slope and see if it's negative or positive

anonymous · Answer

oh wait. it may be positive

cal.lavender · Answer

you also need a table for that

anonymous · Answer

...it is a table

anonymous · Answer

hold on. i'll draw it

susanna · Answer

$$\frac{ 1+5 }{ 1+1 }=\frac{ 6 }{ 2 }=3$$

susanna · Answer

slope is positive, so the rate of change is...

anonymous · Answer

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