Question

help?
http://prntscr.com/9ydhor
http://prntscr.com/9ydhry

Answer 1

@dumbcow

Answer 2

for 2nd one, just plug in each point and check if right side equals left side

Answer 3

my answer is C

Answer 4

for 1st one, find slope first
(4-1)/(3-2) = 3/1

then pick point to use as (x1,y1)

Answer 5

my answer to the first one is D and for the second C

Answer 6

@dumbcow

Answer 7

@UsukiDoll

Answer 8

\[y-y_1=m(x-x_1)\]is called point-slope form, and means a line with slope \(m\) passes through the point \((x_1,y_1)\)

if you have an equation of that form, it should be straightforward to pick which equation matches

Answer 9

so would it be d?

Answer 10

which problem are you talking about?

Answer 11

http://prntscr.com/9yduys this one

Answer 12

my mistake were you talking about the other one?

Answer 13

calculate the slope of the line going through the points (2,1) and (3,4)

Answer 14

the slope is 1/3

Answer 15

show me your work

Answer 16

my mistake wrong answer

Answer 17

the slope is 3

Answer 18

right. now which answer do you choose?

Answer 19

would it be c?

Answer 20

why do you choose Can?

Answer 21

thanks autocorrect...why do you choose C?

Answer 22

im really not sure because a and b also have a slope of 3 and they're all in the same form

Answer 23

there is no reason to guess here, you have all of the information to reliably choose the correct answer.

you know two points on this line (\((2,1)\) and \((3,4)\)) and that the slope is \(3\)

the point-slope formula is \[y-y_1=m(x-x_1)\]

if \(m=3\) and the convention for writing points is \((x,y)\), which of those equations matches one you can make with your data?

Answer 24

let's try \((3,4)\)

what would the formula for the line going through that point with slope \(3\) be?

Answer 25

\[x_1=3\]\[y_1=4\]\[y-y_1=m(x-x_1)\]\[y-4=3(x-3)\]

do you see that on your list of answer choices?

Answer 26

the last one but its slope is 1/3

Answer 27

well, that isn"t the slope of the line, is it? that is an answer put in deliberately to trap the unwary.

try the other point.

Answer 28

x1=1
y1=2
y-y1=m(x-x1)
y-2=3(x-1)

Answer 29

opps i meant to put 2 as x1 and 1 as y1

Answer 30

so it would be y-1=3(x-2)

Answer 31

ok, that's better.

Answer 32

so the answer would be A

Answer 33

appears so

Answer 34

as for the second question i believe the answer is A

Answer 35

check it by plugging the other point into the equation: do you get a true statement?

Answer 36

(referring to your answer for the first one)

Answer 37

actually, that advice applies to your answer for the second one as well

Answer 38

do you still think a is the correct answer for the second problem?

Answer 39

D was determined true

Answer 40

oh?
\[y-2=2(x+6)\]\[6-2=2(-2+6)\]\[4=2(4)\]\[4=8\]do you usually find that to be true?

Answer 41

y-2=2(x6)
2-2=2(-6+6)
0=2(0)
0=2

Answer 42

x+6*

Answer 43

come on...
\[y-2=2(x+6)\]
\[y-y_1=m(x-x_1)\]

what values must \(x_1, y_1\) have to make those equations match, if \(m=2\)?

Answer 44

\[y-2=y-y_1\]solve for \(y_1\)
\[x-x_1=x+6\]solve for \(x_1\)
answer is \((x_1,y_1\))

Answer 45

(-2,6)

Answer 46

(6,-2)*

Answer 47

sorry, still not right!

if (6,-2) is the answer, then\[[y-2=2(x+6)\]\[-2-2=2(6+6)\]\[-4=24\]

Answer 48

so if A,C, and D are incorrect that leaves us with B

Answer 49

figure out the answer, you clearly need the practice with your algebra!