what is the y-intercept of the function, represented by the table of values below?

X= -2,1,2,4,7
y= 15,6,3,-3,-12

POSSIBLE ANSWERS=

A) 6
B)9
C)3
D)12

Question

what is the y-intercept of the function, represented by the table of values below? 

X= -2,1,2,4,7
y= 15,6,3,-3,-12

POSSIBLE ANSWERS=

A) 6
B)9
C)3
D)12

misty1212 · Answer

is it a line?

misty1212 · Answer

lets check

misty1212 · Answer

no doesn't look like one does it?

anonymous · Answer

no

misty1212 · Answer

and you don't know what it is if $x=0$ but we can guess

anonymous · Answer

11?

misty1212 · Answer

wait a sec, maybe it is a line!

anonymous · Answer

i honestly have no clue haha

misty1212 · Answer

check it 
it is a line with slope -3

misty1212 · Answer

if that is not clear, i can show you how i know it

anonymous · Answer

please

misty1212 · Answer

from -2 to 1 in the x is right 3
the corresponding y values are 15 and 6 which is down 9 
right 3, down 9 slope would be $-\frac{9}{3}=-3$

misty1212 · Answer

that doesn't make it a line, but then i looked at the next two $(1,6), (2,3)$ from 1 to 2 is right 1
from 6 to 3 is down 3
right 1, down 3, slope is $-\frac{3}{1}=-3$

anonymous · Answer

so whats the y intercept then? im a little confused haha

misty1212 · Answer

0 is one unit before 1, so we go up three from 6 and get 9

anonymous · Answer

is it 9?

misty1212 · Answer

yes

misty1212 · Answer

equation of this line is 
$$y=-3x+9$$