Question

Help!! I have NO IDEA about this problem...

Answer 1

y = mx+b, where m is slope \(\left(\dfrac{rise}{run}\right)\) and b is y-intercept.

Answer 2

so how do you find the slope, do you choose any cooridnates?

Answer 3

choose two first, yes

Answer 4

Like I said, slope is rise/run. you have to figure out how much it rise for each run.

Answer 5

http://ts1.mm.bing.net/th?id=HN.608037833003830828&pid=1.7

Answer 6

it's b, because if you look at the y intercept it's 4

Answer 7

ok so i picked (-2,-3) & (2,-1)

Answer 8

You may find it easier to choose any two POINTS on the line (not coordinates). typically I will look to see whether the line crosses the y-axis at some integer y-value and whether it crosses the x-axis at some integer x-value. If YES, it becomes an easy matter to read off the coordinates of these, the x- and y-intercepts.

Look what Lucy had to say: "if you look at the y intercept it's 4." I agree. The y-intercept is (0,4). What is the x-intercept? Write it as a POINT, please.

Answer 9

Yeah ^^^

Answer 10

Once you have two points on the line, you need to apply the formula for slope of a straight line. It looks like \[m=\frac{ y _{2}-y _{1} }{ x _{2}-x _{1} }\]

Answer 11

then we um do the slope formula: -1-(-3)/2-(-2)?

Answer 12

there is an easier way, just saying

Answer 13

What is your result for that slope?

I'd strongly suggest that you write a fraction with a horiz. line, like this:\[-1-(-3)/2-(-2)\rightarrow \frac{ -1-(-3) }{ 2-(-2) }\]

Answer 14

because there's less room for misinterpretation. Again, Tiffany, what is your slope?

Answer 15

@lucyv7129 says, "there is an easier way, just saying." Lucy? What is YOUR slope, m, and how did you find it?

Answer 16

ok so then we solve 2/4 simplified as 1/2 ? am i correct so far?

Answer 17

sorry I don't know how to make the fraction bar horizontal...

Answer 18

u know the y intercept is 4, and the slope is 2 over 1, because u can see that by going along the line, excuse me, but i think i know my math

Answer 19

Two things:

First, looking at the graph, you'll see you move horiz. from -2 to 0; thus, the increase in x is 2. If you move along the y axis upward to the y-intercept, you'll see that y increases by 4.
Thus, the slope is rise/run, or ... ??

Second, you could use Equation Editor (as I did) to write your fractions with horizontal bars, or you could use the Draw utility to do that: