Question

http://gyazo.com/29f78e24c5b6ecaba499910a573e7630
For the y-intercept, could i just plug in 0 into the x and just do it like that?

Answer 1

For example, 13 would be -14? @zepdrix @ganeshie8 @mathmale

Answer 2

Can't see your posted problem (yet).
In general, yes: you do let x=0 and then calculate y.
But that's not enough; you must present the y-intercept as a POINT: (x,y).
Here, obviously, x=0. What is y?

Answer 3

You can't see it? It's the Gyazo link.

Answer 4

Yes, it's visible now, but downloading to my computer was slow.

Answer 5

Oh ok

Answer 6

So would first one be -14 ?

Answer 7

You're on the right track. But what does that '-14' represent?

Answer 8

y

Answer 9

so (0,-14) ?

Answer 10

OK, so now you realize that x=0 and y=-14.
Take that info and write the POINT that represents the y-intercept.

Answer 11

Yes. Very good.

Answer 12

Now find the y-intercept of #14.

Answer 13

(0,3/4) ?

Answer 14

Beautiful.

Answer 15

How do i approach 15, 16 and 17?

Answer 16

Please start out by sharing YOUR ideas about that for #15.

Answer 17

Hint: two parallel lines have ______________ slopes.

Answer 18

parallel ?

Answer 19

Hint #2: The slopes of perpendicular lines are __________________________ .

Answer 20

The lines are parallel (given), but the slopes are not parallel. Think of another descriptor for the slopes of parallel lines.

Answer 21

hmmm. idk

Answer 22

equal.
Type the whole thing out, including 'equal.'

Answer 23

So CD would be -3 also?

Answer 24

Of course I know what y ou're saying, but what you're saying would be a lot clearer if you'd type, "the slope of line CD is -3 also."

Answer 25

-3 is the value of a slope, whereas CD represents a line connecting points C and D.

Answer 26

So the slope of CD would be positive 3?

Answer 27

Which problem are you discussing, 14 or 15?

Answer 28

15

Answer 29

Hold

Answer 30

In number 15, you are told that lines AB and CD are PARALLEL to one another. What do y ou know about the slopes of PARALLEL lines?

Answer 31

they are the same?

Answer 32

No, they are opposite

Answer 33

Actually, the slopes of two parallel lines ARE the same.

Answer 34

Ditch that "No, they are opposite" statement.
You may have meant: The slopes of perpendicular lines are 'negative reciprocals' of one another (not 'opposites').

Answer 35

oh, so the slope of line CD would be positive 3 right?

Answer 36

Answer #15 again: "The slope of line CD is "

Answer 37

why do you feel it's POSITIVE instead of NEG?

Answer 38

Oh so its negative?

Answer 39

The slope of line CD is -3

Answer 40

Repeat: the slopes of parallel lines are EQUAL.
The slopes of perpendicular lines are 'negative reciprocals' of each other.

Answer 41

Right, the slope of line CD is -3, becuase line CD is parallel to line AB, which has a slope of -3. Again, right.

Answer 42

Regarding Problem #16: Please go back and re-read what I wrote above, "The slopes of perpendicular lines are ....

Answer 43

And then 16 would be -5/2 then.

Answer 44

Yes. You took slope 2/5 of the first line and then found the 'negative reciprocal' of it, obtaining -5/2. Very good.

Type out the answer to #16 using the proper vocabulary.

Answer 45

And then 17 is -1/7

Answer 46

Hey thank you soooo much @mathmale . You've saved my life lol

Answer 47

What is the slope of the line connecting points A and B?

Answer 48

delighted to hear that I've been of help. Very happy to spend this time with you.