help on number 20? I need to write a function rule relating x and y.

Question

anonymous · Answer

attachment

anonymous · Answer

just write a linear function :)
$$f(x)=y=mx+b$$

anonymous · Answer

so the answer would be in slope intercept form?

anonymous · Answer

so find the slope of the line which you should get -2 and then plug that and one of the set of points (lets just choose $(1,-5)$) into $y-y_1=m(x-x_1)$ and solve for y :)

anonymous · Answer

when you solve for y, yes  :) ....and f(x) just means function of x which is really just y but you need to write f(x) since the question asks for a function :)

anonymous · Answer

howd you get -2 as the slope? i just got 2

anonymous · Answer

$${{-5--3}\over{1-2}}~~~={{-5+3}\over{1-2}}~~~={{-2}\over{-1}}~=~2$$apologies, yes thats what you should get, sorry

anonymous · Answer

ahah its okay(: and thanks! i got f(x)=2x-7

anonymous · Answer

YUP! :D