Question

Which of the following equations represents a line parallel to the graph of 3x-y=7?
y=7x-3
y=-3x+7
y=-7x+3
y=3x

Answer 1

if you solve " 3x-y=7 " for "y" what would it give you ?

Answer 2

Well "parallel" means they will have the same slope

so 3x

Answer 3

first you need to put in in slop form y=mx+b do you know how to do that?

Answer 4

Oh wow, I didn't even see that, so yea it's not 3x.. It's the opposite

Answer 5

it would be y=-3x+7

Answer 6

the slope is -3 and the y intercept is 7

Answer 7

does that help?

Answer 8

I think it would be y = -7 + 3x? @alenajonesy

Answer 9

y=mx + b

the y-intercept would be in the back

Answer 10

no because it has to be in y=mx+b

Answer 11

y= 3x+7 @alenajonesy

Answer 12

yes

Answer 13

wait no -3x

Answer 14

because your subtracting 3x from the y so it would be -3x

Answer 15

I figured that part out when i went to the answers. lol.

Answer 16

haha ok so anything else?

Answer 17

There's a bunch of questions, if you wouldn't mind helping me?

Answer 18

sure

Answer 19

Okay. Plans for a bridge are drawn on a coordinate grid. One girder of the bridge lies on the line y=-9x-9. A perpendicular brace passes through the point (-1,7) Write an equation of the line that contains the brace.

Answer 20

y-1=-1/9(x+7)
x-7=-9(y+1)
y-7=1/9(x+1)
y-7=-9(x+1)

Answer 21

the equation for this would be y-y1=m(x-x1)

Answer 22

since its already in y=mx+b you don't have to change that you just need to plug in the coordinates and the slope

Answer 23

So the answer is y - 7 = (1/9)(x + 1) ?

Answer 24

do you understand that or need me to redo a step?

Answer 25

I understand.

Answer 26

any others?