Question 59667
y = 3x 

(0, ____) (-1,____) (7,____) >>(x,y)coordinates

x=0
y=3(0)
y=0
------------------------------(0,0)
x=-1
y=3(-1)
y=-3
------------------------------(-1,-3)
x=7
y=3(7)
y=21
-----------------------------(7,21)
(0, 0) (-1,-3) (7,21) 

Pvaka