Find the equation of the line that contains the ordered pairs given on the table.
X=4,2,1
Y_8,4,2
Enter anwser as y=mx+c
please, i need help ! thanks (:

Question

Find the equation of the line that contains the ordered pairs given on the table. 
X=4,2,1
Y_8,4,2
Enter anwser as y=mx+c 
please, i need help ! thanks (:

anonymous · Answer

Using the equation (y2-y1)/(x2-x1) you should be able to find the slope.

(4-8)/(2-4) = -4/-2 = 2

Plugging in this value for m you get: y=2x+c

Now plug in values from your table for x and y to get c

8=2(4)+c  ---->  8-2(4)=c ----> c=0

Therefore: y=2x +0 or just y=2x

anonymous · Answer

thanks so much ! i undestand it now (:

anonymous · Answer

My pleasure! Happy to help