Question

Write an equation in slope-intercept form for a line that is perpendicular to the given line and that passes through the given point.
40) (4,0); y=-2x
41) (0,2); x=-7
42) (0,2); y= -2x-8
43) (12,8); y=-3x-9
44) (-1,7); y=-1/4x+6
45) (4,-9); -x+2y=10
46) (2,1); -2x+3y=-12
47) (-2,3); y=-5x+1

Answer 1

Evaluate D(e) = 3e - 1, where e = 2.
D(2) = 3(2) - 1
D(2) = 6 - 1
D(2) = 5

Answer 2

i don't get it...

Answer 3

@RampagingUbay You still there?

Answer 4

yes

Answer 5

So an equation that would meet you specifications would have a slope opposite to the given equations and when the x value for the point which it passes through is inputted, the y value of said point is derived. Did that make sense?

Answer 6

sorry but no...

Answer 7

i don't know that much english

Answer 8

Ok, the let's do an example problem. the equation of f(x) = -2x looks like this:

the graph of f(x) = 1/2(x) is perpendicular to f(x) = -2x like this:


Since we know that the equation f(x)=1/2x is perpendicular, we just need to add a number until f(4)=0 for f(x)=1/2x. Does this make sense?

Answer 9

kind of...

Answer 10

If you want, I could try and google translate my comments into a language you know better

Answer 11

no its ok

Answer 12

could you do a problem from the top

Answer 13

That was problem 40 that I just started.

Answer 14

Do you know what an inverse is?

Answer 15

is it the opposite ?

Answer 16

Sort of. It's the number flipped upside down. So the inverse of 3/1 would be 1/3.

Answer 17

can you do number 42-45 please, with out words... ?

Answer 18

I'd rather you be able to do them on your own first. You need to understand this concept because all required advanced math is based on things like this.

Answer 19

if you do it, i will look at your work and try to do the other ones please...
i been stuck on those problems for a very long time

Answer 20

I'll do 42.

y=-2x-8
perpedicular equation = y=1/2x
when x=0, y must equal 2:
y=1/2(0) = 0
thus,
y=1/2(0) + 2 = 2

The equation is y=1/2x+2

Answer 21

so 43 is
y=1/3x-9
y=1/3x+40

Answer 22

No, 43 would be y=1/3x to y=1/3x+4.
where x=12, y=8 so:
y=1/3(12)+4
y=4+4
y=8

Answer 23

where did you put the 8 ?

Answer 24

1/3(12) is already 4, so all you need to do to get 8 is add another 4

Answer 25

Binary, so #44 would be y=-4x+6 ?

Answer 26

Not quite, it is 4x, not -44x for the slope, meaning you need to start from the slope again

Answer 27

*-4x

Answer 28

whats with #45. it looks really wierd

Answer 29

you just need to simplify it to a y=mx+b form. It's just variable solving for y.

Answer 30

thanks for everything
gtg cya

Answer 31

no problem