Question

Find the equation of the line on the graph (in the comments)
A. y= 4x-10
B. y= 1/4x +10
C. y= 1/4x +3.5
D. y= -4x+14
E. none of these

Answer 1

So will you post graph?

Answer 2

sorry here it is @geerky42

Answer 3

Can you identify its slope?

Answer 4

no i'm sorry i read that incorrectly. the slope should be (0, -1) ?

Answer 5

Well these are points.

We can identify slope by looking at how steep it is; \(slope=\dfrac{rise}{run}\)

Answer 6

slope basically mean how steep line is

Answer 7

oh. 0/-1 then?

Answer 8

No, maybe we can locate points, then we check how "much" rise and run is.

How about these points?

Answer 9

the points are (3,2) and (4,-2)

Answer 10

Yeah, so can you tell what is rise and run?

Answer 11

Can you read text?

Answer 12

-4/1 ?

Answer 13

wouldn't that be our rise/run?

Answer 14

Right! for each run 1, we do down by 4. (-4)

So our slope is \(\dfrac{-4}{1}=\underline{-4}\)

Answer 15

So now we know slope. we can eliminate A, B, and C, because slope is not -4.

Does that make sense so far?

Answer 16

yes that makes sense so far. thank you :) okay so what's next

Answer 17

Ok, so far we have \(y=-4x+b\)

We still need to find \(b\) (y-intercept). Do you know how?