Question

i have to find the x and y intercept of these questions so can anybody EXPLAIN to me how to do them and not just give me the answers? thanks you to anyone,
y=-7x
y=1/2x=3
-2y=5x-12

Answer 1

You ALWAYS need to put it in standard form first.
Standard form: y=mx+b

So, m= slope
b= y-intercept

Answer 2

and x=variable

Answer 3

so then it would be y=-7x+b?

Answer 4

yes :)

Answer 5

And when finding the x intercept, make y zero
And when finding the y intercept make x zero :)

Answer 6

0=-7+b right? then what would be after that?

Answer 7

Yes :-) So then add 7 to both sides so you get the variable on one side :)

Answer 8

Make sure it is positive 7 though!

Answer 9

7x or just 7?

Answer 10

Just 7 :)

Answer 11

7=x+b?

Answer 12

Yes. so make x zero now to find the y intercept :)

Answer 13

do i start from the beginning again or just keep going off from the 7=x+b?

Answer 14

Keep going on that equation, and make x=0., does that make sense? :)

Answer 15

yes so it would be 7=0+b

Answer 16

Yep! Now get b by itself to find the y intercept when x is 0 :) That will give you your first ordered pair!

Answer 17

how do i get b by itself?

Answer 18

Well actually I messed up :) You already have b by itself, so when x is zero y=7.

Answer 19

So the first ordered pair would be (0,7)

Answer 20

ok so then that is the answer for the first one?

Answer 21

Yes :) Now do you want me to work through the next one with you? :)

Answer 22

yea because its different because it has the 1/2 and everything

Answer 23

Lol ok :)

Answer 24

so i think the first thing i would do is turn 1/2 into 0?

Answer 25

Yeah, because it would be 1/2 times 0 which equals zero :)

Answer 26

y=0x=3?

Answer 27

Yep :-)

Answer 28

So when x is zero y is 3, right? :)

Answer 29

yeah

Answer 30

So now you just found another ordered pair! (0,3) Do you understand what the x and y intercept means?

Answer 31

yes and thank you for helping me with these problems. with the last one though what would i do since the y has -2 with it?

Answer 32

You are welcome, it is my pleasure! Let me look at the last problem here real quick :)

Answer 33

Ok so to find the x and y intercepts we do what we just did.
Make x zero to find the y intercept and then i will help you with what to do afterwards :)

Answer 34

-2y=0-12

Answer 35

Yep :-) Sorry I was doing something real quick. So -2y=-12. Now divide each side by (-2)